I am trying to edit the quantity of an item in my wanted list but keep getting
an error message regarding saying only one item colour / combination? Ive never
seen this before?
Remove the duplicate wanted item.
Please note that the duplicate may be in ANY of your wanted lists if you have
more than one. It is likely caused by a merge of two catalog items. The index
of wanted lists will indicate which of your wanted lists contains the problematic
duplicate.