I'm now getting a "Odoo Warning"   "Integrity Error - duplicate key value violates unique constraint "account_invoice_line_pkey" DETAIL: Key (id)=(46) already exists.

This was when I clicked the "Update" button on a new invoice for Tax.    It happened prior when I just tried to Save the Invoice.    As far as I can tell looking in the database there shouldn't be any ID=46 already.

Pressing save I get a new error:    "wkf_instance_pkey"  DETAIL: Key (id)=(43) already exists.

If I press Save again I get the following:  "wkf_instance_pkey" DETAIL Key (id)=(44) already exists.

What's going on and how should I get this fixed?