FB05- screen layout different via FLB1

Dear SAP Guru's

I need your help. The layout of Post with Clearing: Create residual items is fine via FB05 where the user can see the right side of the screen that has the amount entered, assigned, difference postings and not assigned cannot view this without scrolling over via the lockbox postprocessing FLB1. I can't figure out where in the set-up is wrong? I tried the transaction codes for defining line layout and attaching the line layout to Transaction code are as O7Z4S and O7V3 for FB05 but that didn't work. The set-up o FB05 is fine if you access the screen directly but if you are processing lockbox via FLB1, the screen is different.

PLEASE HELP!

POINTS AWARDED