BC, LC: Edit: Disable auto sort.

src/Model/BoundaryCondition/BoundaryCondition.py

@@ -315,6 +315,9 @@ class BoundaryCondition(SQLSubModel):
             self._data.sort(reverse=_reverse, key=key)
         self._status.modified()
 
+    def index(self, bc):
+        self._data.index(bc)
+
     def get_i(self, index):
         return self.data[index]