Hi,

I am not sure how much support I can still get on this legacy SP element,
but I will try my luck anyway.

I have installed SPConstraintLists add-on to WSS 3.0 site and defined a
multi-column unique key for a custom list (template #100).
This site is intended for Model Number management of our hardware products,
so I want to have the Model # field itself to be unique (to prevent
duplicate model numbers) and I also need to have a combination of several
fields to be unique to prevent someone entering a Model # with duplicate
combination of features.

Therefore I have two unique keys defined:
- Model #
- Multi-field key

However, in the process of creating this custom list I had to change
available drop-down choices for some look-up fields a few times and then I
started getting some weird issues with the uniqueness of the fields:

1. It complained that "Found existing unique key values" when I tried
adding a new item to the list, even though there was no such item in the
list (it is possible that such item existed there before, but was later
deleted before such unique key was defined)
2. I am able to create a duplicate item with all fields that are all part
of a multi-field unique key being the same and I get no error

What I did so far:
I tried deleting the multi-field unique key and re-creating it again - no
difference.
I tried de-activating and re-activating the feature for this site - no
difference.
I tried deleting all keys, deleting all items in the list, then re-defining
the keys and adding items back to the list - same issues as above (errors
on supposedly violated uniqueness or ability to add duplicates)

Not sure what else to try next.
Any help is greatly appreciated, since I really don't want to write my own
event handlers to ensure these conditions.

Thanks in advance!