It’s a bit hard to read, but a couple of comments:

• That Varset looks like it updates the Key Field which is risky, it can circumvent the Link Write functionality. Either the parameter “Ean” holds exactly the same value as the XMLGet so there is no point in updating it, or they are different and you have just broken the Link Write.
• A long shot, but Alpha 13 is not the same as Alpha #13. XPA might be doing some Picture conversion during the link write which the Varset is not.

In either case a condition of LoopCounter() > 1 on the Varset should fix it, but any difference in the Ean value between XML/Param/Table might still need some consideration.