Auto PO from Shipment Cost

Dear Experts,

I successfully transferred shipment cost document (VI01 or VI02) to PO and with the help of OSS note 506605 I can change the PO doc type from NB to customize doc type as needed, I'm using EXIT_RV54POCR_006 to change the PO Doc type.

But, I have a requirement to differentiate the PO Doc type per Company code/Plant, as our company has many mills (ie: plant1 = PO doc type should ZNB1, plant2 = PO doc type shoul ZNB2 and so on).  Do you know a way how to do it within this function EXIT_RV54POCR_006?

Regards,

Beto