Typically, manual pegging is done from the customer order line and linking them to a Purchase order since the system automatically pegging based on demand and supply rules and manual control from PO side is not supported. 

However, there were an issue in APP10 where the user can manually unpeg the PO line if the user didn't refresh the screen after direct delivery and that unintended behavior is also getting corrected in App10UPD27, ensuring that pegging remains controlled from the demand side (Customer Order or Shop Order) as intended. The procurement team may need to coordinate with sales or production teams to manually adjust pegging via CO or Shop Orders in the given scenario or you may look for a modification for the subject requirement.

​@Basuru_Ilesinghe that you for confirming what I thought.  We were hoping to negate the need to have to speak with sales or planning each time we required items to be pegged.  I will further explore the automatic options to see if that can help reduce the number of instances we have to manually peg.