"Purchase Order. Record Already Exists -  next number field is to be updated in PO setup -Options- Documents and  Next Number. 

Client keeps jamming up the numbers by manual entry of the field - has someone built  a logic around to deny manual input of numbers on the PO number field or can we grey out the field where by end user cant type over it.

Client is happy to find permanent fix rather than always logging out people and fixing the next number .