EBS - fill assignment field with bank reference

Hi,

We are trying to fill the bank reference for incoming payments in the assignment field for the GL postings. For the 2 banks it is working fine, since they send it in 88 record and we have defined search string to fill in assignment field. We use BAI2 format

But for 1 bank, the bank reference is sent in 16 record, and search string does not work for 16 record. But i do see the bank reference filled in FEBEP-VGREF.

With userexit i can probably populate this in the assignment field but is it possible using standard algorithm?