Linking one reprot to another using a URL and passing a report field from the main report to the lower report

HI,

I know there is lots of information out there and I ahve tried many different scenarios and I'm sure this is a dub question, but heregoes.

I have a main report that has a field PO_NUMBER  Fields!PO_NUMBER

My sub report has the same field as a paramter. I am trying to pass the PO number from the main report to the sub report.

This is the URL I am trying to use:

Trish Leppa