BAPI_PO_CREATE1 - EAN11

Hi, my name is Javier Maldonado and I'm using the FM BAPI_PO_CREATE1 to create a purchase order, everything is ok except that is no place to map the european article number in the inteface, the system automatically takes the principal EAN, but I want to assign another valid EAN for the measurement unit used for the material.

Any way to send that field?

Best regards,

Javier