Thank you @jharvey 

What does "period of participation" mean?  It is a vague term, and I haven't found an example.  I think that if the earnings underlying the pension arise while the taxpayers are married AND living in a community property state, then the pension is community.

Pensions don't automatically split 50/50 on an MFS return for community property states because they are sometimes considered separate property.

I would like LC to have a joint box for these situations when they are community property.