What version is that exactly? 9.0.x-what?
Both datasources are extracts, correct?
FIRSTOFMON is of what type? Is it a calculation?
FLEET is of what type? Is it a calculation?
Once I have these answers I'll try to reproduce but it does look like a bug so might be easier if you'd just file a support ticket.
Version is 9.0.5 32-bit.
And yes, both are from extracts (tde's). And no, neither one is a calculation. Thanks for responding.