How can i change SY-TCODE in runtime?

Hi All,

I have to copy standard transaction and i want to avoid copy all standard objects, my goal is just copy objects that are necessary but there is some standard function modules that are requesting for sy-tcode as i told you my transaction is 'Z' one. Then i would like to know if there is a way to change the sy-tcode value in runtime because i would like it contains standard transaction in stead of my 'Z' transaction.

Thank you in advance!