Valuation price different at Item level and service level in a Service PO

Hi ,

We have an issue in a serive PO where the net price at the item level doesnt match with the net price at the service level . This issue happens only when the PO has multiple line items .

Example ;

Item 10 qty 1 : serive line has 120 qty and 100 gross price --> net price at item and service level is120000

Item 20 qty 1 : serive line has 100 qty and 100 gross price --> net price ay item is 120000 and at service level is 10000

Please help me on this issue .

Regards,

Hari.