Infotype changes - what transaction was used?

Hi all,

I am looking for a SAP standard report that would achieved the following:

I want to report on the IT changes made by the payroll department "manually" rather than via the payroll processing transactions.

For example if an PY employee changes data via PA30 rather than via the PC00* transactions.

I haven't found a report yet where the transaction used while changing the data is logged.

Any ideas before I look into a possible SQ01 report?

Thank you

Coco