Workitem is not generating for an Inbound Idoc

Hi All,

The problem I am facing, when inbound idoc is processing in SAP, if there are any errors occurred, it would generate a work item and that will be sent to user Inbox (SBWP) as per the workflow. Here it is not generating a work item for an inbound idoc where is there is an error. So user is not receiving work item mail to inbox, to check about the idoc error. This idoc has been processed through the function module.

Could you please let us know your input on this issue.