Comment 4 for bug 1834509

@Ian, you are correct. However, your example creates an ambiguous schematic. U2B cannot be a different part that U2A/C/D. I think the ERC will flag this. If not, it should. There is no way to know the user's intent in this case. Did they really want to use a different component or is this a new component and they forgot to update the reference? I don't want the schematic editor to make assumptions about the users design. It should only warn the user when something is amiss. I'm not sure we want to run an ERC to check for errors every time we launch the symbol table editor.