PMW - BACS - UK - clarification please

Hi,

I have a query here in regard to BACS Direct Debit Process.incoming payments..GB BACS

How do we generate first , Recollection & final collection file in BACS format using Payment Medium: GB BACS in IS-Retail module.

Do we have any separate transaction available and do we need to create separate Pay method for these 1st, Regular & final collection and is there any specific config required in regard to bank transaction codes in the file?

These files specifically require different bank code(Say 01(First Coll)....18(Recollection) etc....). Will GB BACS support these different file creation or do we need to create customs enhancements for this?

Cheers,

Ashok