In case anyone is looking for a fix to this, in account/invoice.py find line key = (val['tax_code_id'], val['base_code_id'], val['account_id']) and replace with: key = (val['base'])
In case anyone is looking for a fix to this, in account/invoice.py find line code_id' ], val['base_ code_id' ], val['account_id'])
key = (val['tax_
and replace with:
key = (val['base'])