344     def BlockCompatibility(self, startblock=None, endblock=None, direction=None):

   344     def BlockCompatibility(self, startblock=None, endblock=None, direction=None):

   345         if startblock is not None and endblock is not None and \

   345         if startblock is not None and endblock is not None and \

   346            (isinstance(startblock, SFC_Objects) or isinstance(endblock, SFC_Objects)):

   346            (isinstance(startblock, SFC_Objects) or isinstance(endblock, SFC_Objects)):

   347             # Full "SFC_StandardRules" table would be symmetrical and

   347             # Full "SFC_StandardRules" table would be symmetrical and

   348             # to avoid duplicate records and minimize the table only upper part is defined.

   348             # to avoid duplicate records and minimize the table only upper part is defined.

   350                 startblock, endblock = endblock, startblock

   350                 startblock, endblock = endblock, startblock

   351             start = self.GetBlockName(startblock)

   351             start = self.GetBlockName(startblock)

   352             end = self.GetBlockName(endblock)

   352             end = self.GetBlockName(endblock)

   353             for val in self.SFC_StandardRules[start]:

   353             for val in self.SFC_StandardRules[start]:

   354                 if end in val:

   354                 if end in val: