Solution : https://service.sap.com/sap/support/notes/395969 (SAP Service marketplace login required)
Key words : 
assign user-defined function modules, additional key words eh&, remove function module, respective standard module, user exit type, managing user exits, maintain table tcguety, function modules, user exits, table tcguety
Related Notes : 
       
| 394519 | Installation of SAP EH&S 2.7B/4.5B | 
| 393855 | Installing SAP EH&S 2.7B/4.6C | 
| 392841 | Installation of SAP EH&S 2.7B/4.6B | 
| 391318 | EH&S 2.7B corrections: Support Package 01 |