delete PR line item which was created wrto Sales order and Sales order has delivery document created.I have checked various scenarious in SCN and nothing there exactly for this

Hi all,

I need to delete PR line item. PR has outline agreement. PR is created wrto Sales order. When try to delete PR line item getting error that Sales order document is associated with it. When I try to reject the line item in Sales order it is greyed out. Can I delete the Sales order line item ? it's even not allowed to delete sales order line item and saying subsequent document is associated with it which is delievery note. please suggest.

Thanks.