Relisted an item (changed from auction style to Fixed Price; a vintage jewelry-repair kit). I changed nothing in the Item Specs, and got this screwy warning:
"Warning: Warning Code 21917020: cannot change to requested quanttiy. Original txn quantity = {0}" [misspellings not mine]
I think eBay has out-sourced some of their programming or whatever department keeps the system in synch with the various listing policies and prohibitions. That's what accounts for the misspelled words in the error message, and maybe that's what accounts for the glitch.