Trying To Undo A Part Of A Sub Procedure

I am using unbound forms and multiple recordsets to save data into a number of tables. The save procedure is two parts: the first one saves data from a temporary table tblT to tblA. Second part takes the primary key of this new record in tblA and stores it with additional data in tblB.

In case there is an error, this procedure creates all kinds of problems. Usually the errors happen in the second part of the code and by then the data has already been saved in the tblA. On Error, the sub exits. When the user makes changes in the info and retries to save, the sub again tries to save data from the tblT to tblA, but now runs into primary key problems as the data already exists! (the reason for this is because the primary key field for tblA is filled with an autonumber generated by tblT).

Ideally, on error, the sub should delete the last record (or two or three, as the case may be) from tblA so that they can be re-stored by the sub on resumption. I cannot get either an SQL statement or a recordset to identify exactly these records to delete them. All help is highly appreciated! Also, any suggestions towards alternative methods of achieving this are most welcome!

Thanks in advance!