According to the documentation if you set IncludeItemCompatibilityList to true you should get Item.ItemCompatibilityList container . I do not. I do however return <ItemCompatibilityCount>170</ItemCompatibilityCount>. This was listed using Ktype compatibility.
Anyone know how to get a list of attached ktypes for a listing using an item id?
The same call on the sandbox gives me an error "[ErrorCode] => 10007 [Value] => reader must be on a START_ELEMENT event, not a 11 event" but works fine on production. Albeit no item compatibility list