So sometimes when I create configurations of parts or assemblies the Custom Properties that are defined through EDPM don't convert over properly. Everything seems fine in the 'standard' configurations but any other will either have a few custom properties missing or something else wrong entirely. Picture below:
It doesn't help when I have an Assembly with a certain configuration and want to add a BOM with the Revision number in it. Other oddities I've seen are that a property such as a SolidWorks Material will copy over as pure text in the configuration so that I've had the issue where I've changed a parts material but it won't update in the BOM for that configuration because the old text has saved without changing.