Are you running into the following error when attempting to list an item using any of the AddItem family of calls?
<ShortMessage>All locations are dropped.</ShortMessage>
<LongMessage>All locations provided for shipping service "57106" are not allowable for this site.</LongMessage>
ShipToLocations is a field which takes a string value. However, this does not mean that any value is accepted. To find out what values are accepted in this field, you need to make a GeteBayDetails request specifying ShipToLocations in the DetailName field. Use the ShippingLocationsDetail.ShippingLocation field in the response as the value to pass into ShipToLocations in AddItem.
Error 17521 indicates that the ShipToLocation specified in the ShippingServiceOptions or InternationalShippingServiceOptions container has an invalid value.
To find the appropriate value:
1. Make the following GeteBayDetails request against the SiteID that you are intending to list the item on.