Add a p.o. to a service order after it was creeated.

We have a lot of back office staff and our AP clerk accidentally deleted a line on a service order that has a P.O. attached to it.  Now we have no way of getting correct costs to the service order that will reference the any accounting data in the system.  we need to add the line back so we can have the backup of the P.O. and then the trail to the AP invoice so it shows on the service order as the customer requires all backup and the AR clerk can invoice the service order for the correct amount.  We are running 2019R1.

In a side note, the rest of the system should talk to the service management for proper cost accounting.