AWS createfulfillmentorder "A create request already exists for MerchantFulfillmentOrderId

Question

I'm running into an error when creating outbound fulfillment orders in MWS. Every time I create a fulfillment using peddler, I get this response:

A create request already exists for MerchantFulfillmentOrderId : xxxx

The fulfillment is created sucessfully in MWS but I get this error response regardless. What's going on here?

Answer 1

Yes, you have to create a new "Merchant Fulfillment Order Id" for every new request. It cannot already exist.