:: :: :: Im getting this on an insert and its been driving me batty
:: :: :: for a couple hours. It's a simple insert with parameters.
:: :: :: The insert looks fine and worked until recently.
:: :: ::
:: :: :: Any ideas what it doesn't like? None of the params are " ".

This was it:
CREATE UNIQUE INDEX "IDX_Cart_1" ON "Cart"("InvoiceNo");

When trying to insert new rows and InvoiceNo was null, it did this. Null is
not a value - so why would this be a problem?