create ledger journal trans and mark with cust invoice (cust trans open)

Hi

I am in Axapta4.0 and I do import customer payments from paypal by code (into LedgerJournalTrans) (not posted. Only created). Now I want to mark the imported payment against an open customer transaction (which is a customer invoice).
When I try to view the marked records in the form for the imported payments there is no marking available. In the spec trans I cn find my entry.

Can someone help me out?