Message related to Service level item changes in Purchase Order not getting displayed in smartform

Hi ,

The modification messages at service level in PO are not being captured .  I have debugged the code and found that for standard output type there is package number at service line item hence it is capturing the changes . This is a standard functionality .Refer to the attached snapshot the debug points for standard and custom both .

zneu has packno initial.Hence further call is aborted.

FOR NEU , works fine.

Can you explain me why the pack no is coming blank for custom.

Thanks

Barun

Accenture