Double Invoice check across company code

Hi All,

I have been trying to use the double invoice check functionality across company codes. i.e. when an invoice is posted in Company code A with ref no: xxx, and when I try to post a new inovice with the same reference ie. xxx in company code B, system does not give error message.

Please note: I have maintained message in application F5, no: 117 and 312.

Also in customization for double invoice check, I have unchecked "Check Company code" and checked "check reference" and "check invoice date"

I have also maintained the double invoice check flag in the vendor master.

Please help at the earliest.

Regards,

Ankush