In case of Usance Collection, the documents are accepted in BCTPAY transaction but a final settlement at maturity takes place in the transaction 'Settle Usance Documents at Maturity'.
To Settle usance amounts for an existing Import Collection contract, BCTSUS transaction is used.
Select it from the menu item[Import Products -> Import Collection -> Main -> Settle Usance Docs at Mat.].
having to select the relevant menu)
When you have made your changes, click on the ( ) Save function to save all the the data entered in the transaction to the database.