- Item Q10316155 was being test-edited.
- A site link was removed from item Q10316155.
The link was moved to item Q10316155, but I thought the removal was a test edit, so
- I tried to undo the removal.
-> An error mesage appeared: "Site link [[ptwiki:Lameque]] already used by item [[Q10921342]]."
Because there were test edits at the page, I glanced at the id "Q10921342", saw it was similar to "Q10316155", and assumed that it was the same, and that an edit conflict happened.
Suggestion: add "another":
"Site link [[ptwiki:Lameque]] already used by item …." →
"Site link [[ptwiki:Lameque]] already used by another item …."