Solution : https://service.sap.com/sap/support/notes/612564 (SAP Service marketplace login required)
Key words :
job class 'a', relevant support package, bapi_xbp_job_open function modules, transaction sm36, lower case, terms job_open, sm36 reason, program error, solution import, correction instructions
Related Notes :
| 712160 | Problems when starting jobs (composite SAP Note 2) |