Solution : https://service.sap.com/sap/support/notes/379596 (SAP Service marketplace login required)
Key words :
additional key words key words, additional fields include required entry fields, additional fields tab page, abap statement raise error, customer-specific additional fields, required entry field checks, cost element master record, required entry fields, empty additional fields, prerequisites additional exit
Related Notes :
| 1257462 | Checking additional fields in activity type category |
| 931407 | Checks of additional fields in the cost element master Part2 |
| 202921 | Reqd entry fields for customer-specific flds in cost centers |