Why is the AR Bank Statement process limited to the Trade receipt code = 'C'

 

We are using the Bank Reconciliation process and are planning to start using the AR_BNKSTMT process to load Deposits.  I see that the App. Engine explicitly requires a Trade Receipt Trans Code = ‘C’. We have Bank codes in place for our current Processes that does not include ‘Trade Receipts’.  Why is the AR Bank Statement process limited to the Trade receipt code specified in the AR_BNKSTMT Process?