I'm trying to make a new plug/connector symbol. Edit/modifying other symbols in our library, there's an attribute called "TerminalNumber" I want to use, but it's not in any of the existing attribute tabs (Symbol Create Wizard - Step 6). I tried to add this attribute as a custom using the steps here:
How to Add Custom Symbol text Attribute in Promis.e CONNECT - OpenUtilities Wiki - OpenUtilities - Bentley Communities
But I get the error "object reference is not set to an instance of an object." Is this the correct way to do this or am I barking up the wrong tree?