I have discovered that a group of expense transactions were accidentally placed in a asset account rather than an expense account. As a result I need to adjust the transaction and consequently most of my BAS to correct the error.

Because the BAS have been "filed" I am unable to edit the transactions.

I have not recorded "payments" or "claims" against any of those BAS.

When I open any of the BAS that need to be edited there is no option/button to "Mark as Unfiled".

Can anyone tell me how I can fix this please?