Hello, maybe this is old. but i'm facing same issue.
i try to find help, but i led to your subject and no proper answer.
until i try to figure it out, i found some solution.
i hope this will help the other who facing same issue.
in my case, no flange available due to the project is upgrade from PDMS. so it's may be some miss structure/hierarchy of sele.
I notice that the FLAN, especially in SELE, it have so many combination of sele.
you will see when you modified the spec (see picture).
so, My soultion make them only for one configuration.