Yes/No flag in SSAS

I have a claims transaction fact table and some of the transactions are considered "historical" in nature meaning that they were manually entered from a legacy system.

Our business users sometimes need to filter out the Historical transactions when looking at Claim amounts for certain periods. My question is should I create a Historical Type Dimension with Yes/No attributes and have the FK live in the fact table or do i just add a Historical Yes/No field in the fact table as a Degenerate Dimension?

thanks
Scott

Is there some other dimension that can have the flag added to it? (junk dimension) I would find a place in a dimension that already exists (claimtype?).

It's really not tied to another of the dimensions that I have setup.

It's basically tied to the individual transaction. Most of the transactions are not historical, but there are a couple hundred that are. I just need a way to filter them out of the cube if the users don't want to include the historical transactions.

Use tinyint and put a 1 or 0 in the value, put directly on the fact table. Don't use bit because you can't sum bits.