Still not working correctly

The administrator followed the previous instructions and the issue persists.

I can add the vendor as alternative to an item in item edit however no further actions can be taken.

If I go to the Vendor Center then Manage Vendor Items, any edit to the item (adding cost, vendor part) errors out while saving with the message "Enter a valid value in the Purchase U/M".

No value will work in the Purchase U/M; the original PU, the wanted PU, or leaving blank.

Conversely, I cannot go directly to the Vendor Center/Manage Vendor Items to add an item as an alternate at all. Errors upon saving with the same message "Enter a valid value in the Purchase U/M".