Column for Purchase order type only

Hi,

I have a voucher type created as Fuel purchase order under purchase order.

I have created below code which force user to record odometer reading. I dont know how to assing the same to Fuel purchase order type. Anybody can help?

[#Line : EI Column One]
Local : Field : Fuel Purc Order Set as : IF @@IsPurcOrder
Add : Right Field: At Beginning :Odometer
Local : Field : Odometer : Info : "Odometer"
[Field:Odometer]
Use : Short Name Field
Width :10
Align : Center
Border :Thick Left Right
Skip on : $$IsEnd:$StockItemName

[#Line : EI Inv Info]

Add: Right Field:At Beginning : Odometer

Local : Field : Default : Align : Left
Local : Field : Odomter : Info : " "