Posting Goods issue in different UOM than Delivery

I want to post goods issue which will be in different UOM than delivery through BAPI/FM.

Any Function module or BAPi will be helpful with the list of parameter to be passed.

I tried using ws_delivery_update with quantity passed in BASE UOM(Different than Sales UOM on delivery/Order) , but it always post material document(Godds issue) in sales UOM.

Is there some customizing which controls UOM on material document ?

Or i am missing something here  ?

Please suggest something.

Thanks in Advance.