Hey David,
CATSDB does not have FISTL, however PTEX2000 does. That said, when you run the posting job, SAP has all of the costing fields except FISTL hardcoded to create a BDC table that uses PA30 to update 2001/2002/ASSOB_HR. No configuring there.
So creating a custom field in CATSDB allows us to configure/add it to the CATS webdynpro. A enhancement in one of their function modules got zzfundctr to PTEX2000-FISTL. Now all that is left is to mod LPTEXF02 to add FISTL.
And no help from SAP, of course! It is designed to work this way.
Oh yes, congrads on your latest award!!!