Hi, Two of my listings were rejected with the following error... API Error. Duplication in selected shipping services. Please use a given shipping service only once.
There is no duplication of shipping service in my listings, does this have something to do with the new USPS rates? I do not use calculated shipping, I use flat rate shipping that I set the price for. I did not think that there was anything I must change in the shipping area, is there?
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