Service Entry Sheet Issue

Dear Sappers,

I'm creating SErvice Entry Sheet(SES) with respect to Serviec PO.When I'm putting the Service PO number in SES, the data in Service PO is not populating in SES.

Can anybody tell me is there any setting is there for SES so that when I'm putting my Service PO in SES, the respective data I maintained in Service PO will populate in SES.

Is it a Standard Functionality of SAP in Service Management.

When I'm doing MIGO respect to PO, all data is populating in MIGO except value.But in SES, it is not coming.

Thanks & Regards

PKB