Zprint program is not attaching in debugger

Hello,

We have our own zprint program and we have congiured the print program for the particular output type. I am trying to spool the out from MB02 transaction . While the spool file is generated i want to put a breakpoint and check the flow.

From MB02 when i click repeat output and save the debugger is attaching in RV_MESSAGES_UPDATE function module , from this stage i would like to understand how the spool file is generated. or which routine is generating the spool file.

I checked the TNAPR table and got the rountine name and put the external breakpoint in the beginning of the routine it is not

attaching with debugger .

Any idea how to attach the debugger or how to find which routine is generating the spool file.

Thanks,

kevin.