You can create project coding mask X... event if there are project numbers beginning with X.

The standard project definition must differ from the definition of the operative project.

You can use only numbers for a project coding mask definition.

You can use an indicator to determine that only coded project numbers may be used within the project system.

The purchase order can be updated in Goods Receipt for Purchase Order (MIGO)

The purchase order is updated automatically to match the new quantity while saving the project.

A workflow can be triggered to inform the purchasing group.

The system automatically creates a new purchase requisition with the difference to the original quantity

Define a user status to lock the business transaction Update Project.

Set the system status to "Lock Master Data".

Activate access control lists (ACL) for the user master record.

Activate access control lists (ACL) for the project profile and the network profile