Problem when BAPI with this RETURN MESSAGE

Hi experts,

I want to use this BAPI "BAPI_MATPHYSINV_COUNT" to enter the count for a specific physical inventory document, after I assigned required data. The RETURN table shows following messgaes:

TYPE :A

ID :M7

Number:695

Message:Required function MB_PHYSICAL_INVENTORY not processed

And the count haven't entered the physical inventory document. Could anyone give some advises to solve this problem? Thanks a lot.