How to Reset the Deletion Flag through a BAPI/FM of Equipment

Hi All,

My Requirement is to reset the deletion flag through a BAPI/FM of Equipment, All though i have a Function Module IMAS_CHANGE_STATUS_SINGLE.But whenever i am executing the IMAS_CHANGE_STATUS_SINGLE by passing the Object Number and Activity Code i.e AM13 for Reset the DeletionFlag it is giving an error, I am completely clueless Please help...

Thanks in Advance