Settle Results Analysis data

hi,

i am using POC based Results Analysis.

my results are either WIPR or RUCR (depending if actual cost is greater or less than valuated cost)

however, when i settle, i get error asking for settlement rule in the WBS.

my understanding is that it should just post debit/credit on the assigned accounts in OKG8 even if there is no settlement rule.

hope someone can shed some light.

thanks,