With out Purchase order how to create receipts.

Hi,

Our Business process is...

We are procure milk from various farmer in small quantity through

collection center.Collection center will collect the milk and delivery

to our plant.

I have only make the inventory receipt for the Quantity

make the Invoice for the received quantity.

No need to raise PO to the individuals farmers also it is not required.

In this case in OPM organization how can we create the receipts with out

Purchase order.

Regards

G.Oliver