Solution : https://service.sap.com/sap/support/notes/214594 (SAP Service marketplace login required)
Key words : 
log bzy=> unexpected return code 13, current ibm information apar, work process trace, program temporary fixes, active sap system, sap system, system returns, error message, dbsl      -call, terms dbif_rsql_internal_error
Related Notes : 
       
| 729136 | iSeries: SQL package R3sidX0000/ECMCT full | 
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| 63037 | AS/400: Deleting SQL Packages |