Hi,

Manual Pegging could be an option to consider.

This can be done from a Customer Order line or Shop Order Material line.

When the Purchase Order (or Shop Order) is received into inventory, it should be automatically reserved to the demand line.

The following is an extract from the IFS Help;

Manual pegging is a method for manually connecting an existing supply to an existing demand. This connection ensures that supplies are automatically allocated to the pegged demands whenever those supplies are received into inventory. Manual pegging is used in cases where you want to override the normal system behavior and enforce a strict connection between a supply and demand. Pegging of a customer order demand can be seen as a pre-reservation of an incoming supply. Manual pegging is key functionality to support resolution of supply problems in a shortage situation. By using manual pegging, the user may create a supply and connect the demand to the supply. The connection will ensure that the supply in question will be available for use only by the connected demand.

I hope this helps.