OK - but why were you unposting the batch? If you needed to list those transactions, you could either print a GL Detail Listing sorted in reference sequence, or a Source Journal, choosing the sequence and fields you needed.

Also, why not use AP for this bank, even if you are not entering invoices. You could record these all as miscellaneous payments (and do the required gl distribution) in Payables, then use its cheque reconciliation function.