Solution : https://service.sap.com/sap/support/notes/786113 (SAP Service marketplace login required)
Key words :
work item repeatedly, referenced support package, sap_wapi_reserve_workitem function module, function module delivers, status 'completed' cancelled', function module, status completed, error message, return code, terms workflow
Related Notes :
| 819147 | EXTSRV object type: Multiple service execution possible |
| 784549 | Executing WEBSERVICE work items repeatedly |
| 715204 | Error when executing WebFlow Service again |