541 Mov type Output

Hi,

I want take challan output print from material document generated after 541 goods issue to subcontractor.

While doing above mov type I m giving refernce of PO no. and that PO number should be printed on challan output print.

But while doing ABAP development material document is not showing me PO no.

How should I guide my ABAPer in above case.

Thanks & regards

Gitesh