Update src/power_grid_model/validation/validation.py

Signed-off-by: Martijn Govers <Martijn.Govers@Alliander.com>

Co-authored-by: Nitish Bharambe <78108900+nitbharambe@users.noreply.github.com>
Signed-off-by: Martijn Govers <martygovers@hotmail.com>

src/power_grid_model/validation/validation.py

@@ -828,6 +828,6 @@ def validate_transformer_tap_regulator(data: SingleDataset) -> List[ValidationEr
     errors += all_valid_enum_values(data, "transformer_tap_regulator", "control_side", [BranchSide, Branch3Side])
     errors += all_greater_than_or_equal_to_zero(data, "transformer_tap_regulator", "u_set")
     errors += all_greater_than_zero(data, "transformer_tap_regulator", "u_band")
-    errors += all_greater_than_or_equal_to_zero(data, "transformer_tap_regulator", "line_drop_compensation_r")
-    errors += all_greater_than_or_equal_to_zero(data, "transformer_tap_regulator", "line_drop_compensation_x")
+    errors += all_greater_than_or_equal_to_zero(data, "transformer_tap_regulator", "line_drop_compensation_r", 0.0)
+    errors += all_greater_than_or_equal_to_zero(data, "transformer_tap_regulator", "line_drop_compensation_x", 0.0)
     return errors