I'n not sure that you can add a function before the initialisation of Payroll, but there is no harm in trying it.
Just before the call of the Payroll Initialisation sub-schema (function COPY with Par1 = ZIN0), insert function BLOCK with Par 1 = BEG, and write "Payroll ABC" in the text section.
Insert function BLOCK with Par1 = END after function COPY.
When you drill down into the Payroll Log, what you see next to the functions are the texts from your schema.
