QIBP_INSPCHAR_SETRESULT

I am trying to record inspection results for a inspection lot in a background task using the FM QIBP_INSPCHAR_SETRESULT. I am encountering the error "Inspection Characteristic with confirmation number 00056764 is already blocked". The documentation says results recorded are not accepted because the inspection characteristic is already blocked in another transaction". I guess this error is because some table is getting locked and hence the error message. Did anyone else encounter such error message and how to overcome this?