diff --git a/power_grid_model_c/power_grid_model/include/power_grid_model/optimizer/tap_position_optimizer.hpp b/power_grid_model_c/power_grid_model/include/power_grid_model/optimizer/tap_position_optimizer.hpp
index 349c9b1a7..0cf466c0e 100644
--- a/power_grid_model_c/power_grid_model/include/power_grid_model/optimizer/tap_position_optimizer.hpp
+++ b/power_grid_model_c/power_grid_model/include/power_grid_model/optimizer/tap_position_optimizer.hpp
@@ -331,8 +331,8 @@ inline auto get_edge_weights(TransformerGraph const& graph) -> TrafoGraphEdgePro
         if (!is_unreachable(edge_res)) {
             if (edge_src_rank != edge_tgt_rank - 1) {
                 throw AutomaticTapInputError("The control side of a transformer regulator should be relatively further "
-                                            "away from the source than the tap side.\n");
-            }        
+                                             "away from the source than the tap side.\n");
+            }
             result.emplace_back(graph[e].regulated_idx, edge_tgt_rank);
         }
     }
diff --git a/tests/data/power_flow/automatic-tap-regulator/pgm-automatic-tap-any/input.json b/tests/data/power_flow/automatic-tap-regulator/pgm-automatic-tap-any/input.json
index 9bc859832..58178eab2 100644
--- a/tests/data/power_flow/automatic-tap-regulator/pgm-automatic-tap-any/input.json
+++ b/tests/data/power_flow/automatic-tap-regulator/pgm-automatic-tap-any/input.json
@@ -11,18 +11,22 @@
       {"id": 3, "u_rated": 10500},
       {"id": 4, "u_rated": 10500},
       {"id": 5, "u_rated": 21000},
-      {"id": 6, "u_rated": 10500}
+      {"id": 6, "u_rated": 10500},
+      {"id": 25, "u_rated": 21000},
+      {"id": 26, "u_rated": 10500}
     ],
     "line": [
       {"id": 7, "from_node": 2, "to_node": 3, "from_status": 1, "to_status": 1, "r1": 0.506, "x1": 1.07, "c1": 5.099999999999999e-06, "tan1": 0, "r0": 11.47, "x0": 2.94, "c0": 5.099999999999999e-06, "tan0": 0, "i_n": 604},
-      {"id": 8, "from_node": 1, "to_node": 5, "from_status": 1, "to_status": 1, "r1": 1.01, "x1": 1.92, "c1": 3.2e-06, "tan1": 0, "r0": 22.36, "x0": 6.11, "c0": 3.2e-06, "tan0": 0, "i_n": 431}
+      {"id": 8, "from_node": 1, "to_node": 5, "from_status": 1, "to_status": 1, "r1": 1.01, "x1": 1.92, "c1": 3.2e-06, "tan1": 0, "r0": 22.36, "x0": 6.11, "c0": 3.2e-06, "tan0": 0, "i_n": 431},
+      {"id": 27, "from_node": 1, "to_node": 25, "from_status": 0, "to_status": 1, "r1": 1.01, "x1": 1.92, "c1": 3.2e-06, "tan1": 0, "r0": 22.36, "x0": 6.11, "c0": 3.2e-06, "tan0": 0, "i_n": 431}
     ],
     "transformer": [
       {"id": 9, "from_node": 0, "to_node": 2, "from_status": 1, "to_status": 1, "u1": 150000, "u2": 11000, "sn": 12000000, "uk": 0.204, "pk": 60000, "i0": 0, "p0": 0, "winding_from": 1, "winding_to": 2, "clock": 5, "tap_side": 0, "tap_pos": 0, "tap_min": -11, "tap_max": 9, "tap_nom": 0, "tap_size": 2500, "uk_min": 0.204, "uk_max": 0.204, "pk_min": 60000, "pk_max": 60000, "r_grounding_from": 0, "x_grounding_from": 0},
       {"id": 10, "from_node": 0, "to_node": 2, "from_status": 1, "to_status": 1, "u1": 150000, "u2": 11000, "sn": 12000000, "uk": 0.204, "pk": 60000, "i0": 0, "p0": 0, "winding_from": 1, "winding_to": 2, "clock": 5, "tap_side": 0, "tap_pos": 0, "tap_min": -11, "tap_max": 9, "tap_nom": 0, "tap_size": 2500, "uk_min": 0.204, "uk_max": 0.204, "pk_min": 60000, "pk_max": 60000, "r_grounding_from": 0, "x_grounding_from": 0},
       {"id": 11, "from_node": 0, "to_node": 1, "from_status": 1, "to_status": 1, "u1": 150000, "u2": 21000, "sn": 25000000, "uk": 0.208, "pk": 80000, "i0": 0, "p0": 0, "winding_from": 1, "winding_to": 2, "clock": 1, "tap_side": 0, "tap_pos": 0, "tap_min": -16, "tap_max": 16, "tap_nom": 0, "tap_size": 1730, "uk_min": 0.208, "uk_max": 0.208, "pk_min": 80000, "pk_max": 80000, "r_grounding_from": 0, "x_grounding_from": 0},
       {"id": 12, "from_node": 5, "to_node": 6, "from_status": 1, "to_status": 1, "u1": 21000, "u2": 10000, "sn": 12000000, "uk": 0.08, "pk": 60000, "i0": 0, "p0": 0, "winding_from": 1, "winding_to": 0, "clock": 0, "tap_side": 0, "tap_pos": 0, "tap_min": -15, "tap_max": 15, "tap_nom": 0, "tap_size": 270, "uk_min": 0.08, "uk_max": 0.08, "pk_min": 60000, "pk_max": 60000, "r_grounding_from": 0, "x_grounding_from": 0},
-      {"id": 13, "from_node": 3, "to_node": 4, "from_status": 1, "to_status": 1, "u1": 10500, "u2": 10500, "sn": 12000000, "uk": 0.005, "pk": 0, "i0": 0, "p0": 0, "winding_from": 0, "winding_to": 0, "clock": 0, "tap_side": 0, "tap_pos": 7, "tap_min": 1, "tap_max": 13, "tap_nom": 7, "tap_size": 150, "uk_min": 0.004500000000000001, "uk_max": 0.006, "pk_min": 0, "pk_max": 0, "r_grounding_from": 0, "x_grounding_from": 0, "r_grounding_to": 0, "x_grounding_to": 0}
+      {"id": 13, "from_node": 3, "to_node": 4, "from_status": 1, "to_status": 1, "u1": 10500, "u2": 10500, "sn": 12000000, "uk": 0.005, "pk": 0, "i0": 0, "p0": 0, "winding_from": 0, "winding_to": 0, "clock": 0, "tap_side": 0, "tap_pos": 7, "tap_min": 1, "tap_max": 13, "tap_nom": 7, "tap_size": 150, "uk_min": 0.004500000000000001, "uk_max": 0.006, "pk_min": 0, "pk_max": 0, "r_grounding_from": 0, "x_grounding_from": 0, "r_grounding_to": 0, "x_grounding_to": 0},
+      {"id": 24, "from_node": 25, "to_node": 26, "from_status": 1, "to_status": 1, "u1": 21000, "u2": 10500, "sn": 12000000, "uk": 0.08, "pk": 60000, "i0": 0, "p0": 0, "winding_from": 1, "winding_to": 0, "clock": 0, "tap_side": 0, "tap_pos": 0, "tap_min": -15, "tap_max": 15, "tap_nom": 0, "tap_size": 270, "uk_min": 0.08, "uk_max": 0.08, "pk_min": 60000, "pk_max": 60000, "r_grounding_from": 0, "x_grounding_from": 0}
     ],
     "source": [
       {"id": 14, "node": 0, "status": 1, "u_ref": 1, "sk": 1e+20, "rx_ratio": 0.1, "z01_ratio": 3}
@@ -38,7 +42,8 @@
       {"id": 20, "regulated_object": 10, "status": 1, "control_side": 1, "u_set": 10600, "u_band": 1000, "line_drop_compensation_r": 0, "line_drop_compensation_x": 0},
       {"id": 21, "regulated_object": 11, "status": 1, "control_side": 1, "u_set": 21000, "u_band": 2000, "line_drop_compensation_r": 0, "line_drop_compensation_x": 0},
       {"id": 22, "regulated_object": 12, "status": 1, "control_side": 1, "u_set": 10500, "u_band": 1000, "line_drop_compensation_r": 0, "line_drop_compensation_x": 0},
-      {"id": 23, "regulated_object": 13, "status": 1, "control_side": 1, "u_set": 10500, "u_band": 1000, "line_drop_compensation_r": 0, "line_drop_compensation_x": 0}
+      {"id": 23, "regulated_object": 13, "status": 1, "control_side": 1, "u_set": 10500, "u_band": 1000, "line_drop_compensation_r": 0, "line_drop_compensation_x": 0},
+      {"id": 28, "regulated_object": 24, "status": 1, "control_side": 1, "u_set": 10500, "u_band": 1000, "line_drop_compensation_r": 0, "line_drop_compensation_x": 0}
     ]
   }
 }
\ No newline at end of file
diff --git a/tests/data/power_flow/automatic-tap-regulator/pgm-automatic-tap-any/sym_output_batch.json b/tests/data/power_flow/automatic-tap-regulator/pgm-automatic-tap-any/sym_output_batch.json
index 2cb1a3897..1476d458c 100644
--- a/tests/data/power_flow/automatic-tap-regulator/pgm-automatic-tap-any/sym_output_batch.json
+++ b/tests/data/power_flow/automatic-tap-regulator/pgm-automatic-tap-any/sym_output_batch.json
@@ -33,6 +33,14 @@
         {
           "id": 6,
           "u": 10048.07315915877
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -55,6 +63,10 @@
         {
           "id": 23,
           "tap_pos": 9
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -87,6 +99,14 @@
         {
           "id": 6,
           "u": 10024.9003318057
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -109,6 +129,10 @@
         {
           "id": 23,
           "tap_pos": 9
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -141,6 +165,14 @@
         {
           "id": 6,
           "u": 10136.77258061671
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -163,6 +195,10 @@
         {
           "id": 23,
           "tap_pos": 9
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -195,6 +231,14 @@
         {
           "id": 6,
           "u": 10144.34439013452
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -217,6 +261,10 @@
         {
           "id": 23,
           "tap_pos": 9
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -249,6 +297,14 @@
         {
           "id": 6,
           "u": 10046.73073697228
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -271,6 +327,10 @@
         {
           "id": 23,
           "tap_pos": 9
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -303,6 +363,14 @@
         {
           "id": 6,
           "u": 10079.02200578903
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -325,6 +393,10 @@
         {
           "id": 23,
           "tap_pos": 9
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -357,6 +429,14 @@
         {
           "id": 6,
           "u": 10165.32348156409
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -379,6 +459,10 @@
         {
           "id": 23,
           "tap_pos": 9
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -411,6 +495,14 @@
         {
           "id": 6,
           "u": 10129.14037222201
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -433,6 +525,10 @@
         {
           "id": 23,
           "tap_pos": 9
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -465,6 +561,14 @@
         {
           "id": 6,
           "u": 10075.37911738707
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -487,6 +591,10 @@
         {
           "id": 23,
           "tap_pos": 9
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -519,6 +627,14 @@
         {
           "id": 6,
           "u": 10048.07315915904
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -541,6 +657,10 @@
         {
           "id": 23,
           "tap_pos": 8
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -573,6 +693,14 @@
         {
           "id": 6,
           "u": 10024.90033180593
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -595,6 +723,10 @@
         {
           "id": 23,
           "tap_pos": 8
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -627,6 +759,14 @@
         {
           "id": 6,
           "u": 10136.77258061701
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -649,6 +789,10 @@
         {
           "id": 23,
           "tap_pos": 8
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -681,6 +825,14 @@
         {
           "id": 6,
           "u": 10144.34439013479
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -703,6 +855,10 @@
         {
           "id": 23,
           "tap_pos": 8
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -735,6 +891,14 @@
         {
           "id": 6,
           "u": 10046.73073697251
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -757,6 +921,10 @@
         {
           "id": 23,
           "tap_pos": 8
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -789,6 +957,14 @@
         {
           "id": 6,
           "u": 10079.02200578931
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -811,6 +987,10 @@
         {
           "id": 23,
           "tap_pos": 8
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -843,6 +1023,14 @@
         {
           "id": 6,
           "u": 10165.32348156435
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -865,6 +1053,10 @@
         {
           "id": 23,
           "tap_pos": 8
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -897,6 +1089,14 @@
         {
           "id": 6,
           "u": 10129.14037222224
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -919,6 +1119,10 @@
         {
           "id": 23,
           "tap_pos": 8
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -951,6 +1155,14 @@
         {
           "id": 6,
           "u": 10075.37911738739
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -973,6 +1185,10 @@
         {
           "id": 23,
           "tap_pos": 8
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -1005,6 +1221,14 @@
         {
           "id": 6,
           "u": 10048.0731591589
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -1027,6 +1251,10 @@
         {
           "id": 23,
           "tap_pos": 7
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -1059,6 +1287,14 @@
         {
           "id": 6,
           "u": 10024.90033180582
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -1081,6 +1317,10 @@
         {
           "id": 23,
           "tap_pos": 7
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -1113,6 +1353,14 @@
         {
           "id": 6,
           "u": 10136.77258061686
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -1135,6 +1383,10 @@
         {
           "id": 23,
           "tap_pos": 7
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -1167,6 +1419,14 @@
         {
           "id": 6,
           "u": 10144.34439013465
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -1189,6 +1449,10 @@
         {
           "id": 23,
           "tap_pos": 7
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -1221,6 +1485,14 @@
         {
           "id": 6,
           "u": 10046.7307369724
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -1243,6 +1515,10 @@
         {
           "id": 23,
           "tap_pos": 7
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -1275,6 +1551,14 @@
         {
           "id": 6,
           "u": 10079.02200578916
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -1297,6 +1581,10 @@
         {
           "id": 23,
           "tap_pos": 7
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -1329,6 +1617,14 @@
         {
           "id": 6,
           "u": 10165.32348156422
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -1351,6 +1647,10 @@
         {
           "id": 23,
           "tap_pos": 7
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -1383,6 +1683,14 @@
         {
           "id": 6,
           "u": 10129.14037222212
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
+          "u": 0
         }
       ],
       "transformer_tap_regulator": [
@@ -1405,6 +1713,10 @@
         {
           "id": 23,
           "tap_pos": 7
+        },
+        {
+          "id": 28,
+          "tap_pos": -128
         }
       ]
     },
@@ -1437,6 +1749,14 @@
         {
           "id": 6,
           "u": 10075.37911738721
+        },
+        {
+          "id": 25,
+          "u": 0
+        },
+        {
+          "id": 26,
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