EAN11 not updated through BAPI_PO_CREATE1

Dear Freinds,

Currently i am using BAPI (BAPI_PO_CREAT1) in my program and purchase order is created.

Now i want to update EAN11(International Article Number) through BAPI.

EAN11 is already standard field available in EKPO table so don't need to add zfields for that.

But it is not there in BAPIMEPOITEM as well as  BAPIMEPOITEMX structure.

So i have added append structure and given field nae as EAN11 in BAPIMEPOITEM and BAPIMEPOITEMX.

Now i have passed data from internal table to above mention structure.

So Purchase order created but EAN11 is not updated.

I have seen in existing forum but it is not matched my requirement.

Please reply.

Regards,

Shiv.