Delete option "Service" in Item Type from PO without effecting Old PO service items
I have below requirement, in which I have to delete option "Service" in Item type from POs,without effecting already created POs(Old) with service items & also whenever copy the service items, the new item should default with item type "Material".
Already I checked this link http://scn.sap.com/thread/3424447 but it solves only delete the "Service" from item type dropdown only, but it is not working for already created POs with Service items,
Whenever i remove the code related to service using above link, it is showing '02' instead of 'Service' for already created POs with Service. Please find below screenshot.
Thanks & Regards