Solution : https://service.sap.com/sap/support/notes/99507 (SAP Service marketplace login required)
Summary : 
      
Key words : 
customer-specific updating definitions, customer-defined updating definitions, runtime error syntax_error occurs, customer-specific update groups, abap/4 runtime error occurs, customer-specific update programs, syntax error reason, customer namespace s500, routine f00 _update, incorrect updates occur
Related Notes : 
       
| 1319517 | Unicode Collection Note | 
| 1002904 | Analysis of TMC2P, TMC2Q and TMC2F | 
| 778122 | Upgrading to SAP ECC 5.0 with SAP ECC AFS 5.0 | 
| 651373 | LIS: Update parameter cannot be changed | 
| 534826 | LIS: Current update programs after upgrade | 
| 310520 | Error messages in XPRA RMCSXP03 or RMCSCLCC | 
| 309335 | Update terminations in LIS | 
| 217178 | CS 4.5B: Additions to the upgrade guide | 
| 204130 | SIS update: Collective note | 
| 198960 | Copies from client: Incorrect update rules | 
| 196241 | Termination for XPRA RMCSXP03 Release 4.x | 
| 188083 | Update terminations after client copy (remote copy) | 
| 183654 | Missing update simulation/log and new setup | 
| 179204 | LIS: Error in method execution after transport | 
| 136303 | SIS: Termination 'PERFORM_NOT_FOUND' in program RMCX**** | 
| 119101 | Generation of SAP information structures possible | 
| 96165 | Trmnation during upgrade to 4.0A/B in XPRA RMCSXP03 |