Thanks ,Paulo.
Is it possible to create a new Z-Field in UserDefined field TAB at WBS element level instead of creating another TAB at detail screen. or Do you recommed using user exit CNEX0001 & CNEX0007 ?
Regarding validations,We will get data from another SAP R3 System so I assume that we will receive a FLAT FILE and we EXPORT data into using Z-tcode and load the data in Z-table so User can take drop down at Z-filed level and SELECT the master data coming from another R3 System.
Please advise if I am misstating anything above.