Please help, thanks in advance.
I am using sap b19.2 PL08 with SQL server 2014,
After creating user defined fields (UDF) within A/R document,
I would like to set some UDFs inactive if user had added data in those fields.
(ex. after adding value in U_Invoice_No and press ok to save, then set this fields inactive. Once this invoice number has been used, user can not change it)
How can I do ? Can I just write SP notification ? any references?