How to generate a PR for back to back without deleting reservation or Awaiting shipping

Summary:

There is requirement from the user where the sales order are going through a back to back process where a PR will be generated automatically by the system.

Unfortunately few SO's PR was not generated due to the error "Quantity has been reduced in the Original document" upon checking found out that the same star item has been reserved to different Sales Order which can be cleared by either deleting the reservation or items to be shipped to the customer.

Customer do not want to clear the reservation for different sale orders or ship to for which it has been reserved, but the PR to be generated.