Solution : https://service.sap.com/sap/support/notes/388803 (SAP Service marketplace login required)
Key words : 
call transaction se37enter function module, manually start xpra rccuvlxp, start function module, call report rsxpraup, run-time objects, additional key words, source code repairs, start report rsxpraup, xpra rccuvlxp whileperforming, starting xpra rccuvlxp
Related Notes : 
       
| 409442 | XPRA RCCUVLXP incorrect variant table content III | 
| 371866 | XPRA RCCUVLXP contents variant table incorrect II | 
| 206328 | XPRA RCCUVLXP contents of variant table incorrect | 
| 158727 | XPRA RCCUVLXP,cntnts variant table,values are mssng | 
| 155674 | Additions upgrade to Release 4.6A | 
| 117668 | Additional info: Upgrading to 4.5B | 
| 48184 | Upgrade: Stopping a running R3up or SAPup |