Import tab in purchase order

Hi,

I am creating PO through ME21N.I am getting tab -Import at header level when po is for one company code XXXX.Document type is NB.

When I am creating another po through ME21N only but for other company code say YYYY I am not getting this import tab at header level for document type NB only.

If i do not want import tab in po for company code xxxx what are setting required.

purchasing organisation,purchasing group,vendor is same in both the cases.

Thanks & Regards