Sequence Number for AR Direct Debit send/deposit to the bank via SFTP

Content

We personalized ElectronicBankRemittance.rtf template for Funds Capture Settlement Format.

The bank specifications require a field called File creation No., which increases by 1 after each file. I did not find any way of creating a sequence as it is available for EFT Payments (via config).
I find this document How to implement Document Sequencing for AR Direct Debit Transactions to an EFT file format ( Doc ID 2669137.1 ) and I used Substr(InstructionInternalID,2,4), which is the mbatch_id. But I still have gaps in the sequence.

Regards,

Version

21A