English to Polish Bus/Financial Transport / Transportation / Shipping

From definition from a commercial contract: "Order" means the order placed by the Buyer for the supply of the Goods and/or Services which is not a call off or a call off order;

I know the term "call off" has already been discussed here but I still find it difficult to render it in Polish in this context.

The next definition in the same contract: "Purchase Order" means any confirmation of a call off or a call off order which can be signed by an appropriate person;