EU Vendor with several VAT numbers

Dear SAP experts,

I face the problem when posting the vendor invoice if my vendor has several VAT numbers. I am not able to display/edit the field "Reporting country" (RF05L-EGMLD) on the document. Subsequently, when running EU Sales List report, the system always shows the first VAT number from the master record of the vendor. If I need to report the invoice on the other(s) VAT number(s) from the vendor master record I am not able to.

My current SAP system is ECC 6.0

Could someone help?

Thanks in advance,

Ivona