UIOR-496 it's we want to add restrictions to which poNumber prefixes/suffixes can be deleted.
When deleting an already configured prefix or suffix, check for any orders with that prefix/suffix. If any exist, do not perform the delete and display an appropriate error message
This will help avoid confusing situations where an order is created with a given prefix/suffix, and the user wants to edit the poNumber for that order at some later time, only to find that the prefix doesn't appear in the drop-down because it's been removed between in the time between order creation and edit.
- Users are unable to remove prefixes/suffixes that are currently used by an existing order
- An appropriate error message is displayed when a delete operation is not allowed