Set parameter id for developed reports

I've created a Z report and am trying to call this report and skip first screen. This is a piece of my code:

set parameter id 'ZFC' field zfact-nfact.

call transaction 'Z2SD60' and skip first screen.

I wouldn't know where or when to do the 'get parameter id' for this report since i don't have access to the PAI of a report (type 1). Any suggestions?