FPCRPO - Blank identification field

I am finding that for accounts where there is already an existing credit clarification line item from a prior FPCRPO_DET run, the new open credits that are configured in TFK_CRPO are appearing in the credit clarification listing but with a blank ID field and the date ID being the date that the item was created. Is this standard? Does anyone know? It seems odd - and hoped that others with experience using the tcode might advise. Thank you.