You can try tracing the item
SELECT Serial64 FROM _Items WHERE ID64 = 124873
Take the serial64 and use it on LOG_DB.._LogEventItem WHERE Serial64 = @
[Only registered and activated users can see links. Click Here To Register...]64 from _items
(you can order by EventTime desc to get the last owner on top of your results), check what actions were done to this item and sooner or later you will figure out the error.
This happened while moving items, and for some reason a slot that was supposed to "accept" an item and before that return its empty, it didn't, instead the slot was full or something along the lines and then you get return -1006.
It's a suggestion, no idea if im right :)