The ability to charge a fee to suppliers for the use of an electronic invoicing system is, however, prohibited unless the contracting authority is a defence authority (see section 67(6) of the Act).
Fodd bynnag, gwaherddir y gallu i godi ffi ar gyflenwyr am ddefnyddio system anfonebu electronig, oni bai bod yr awdurdod contractio yn awdurdod amddiffyn (gweler adran 67(6) o'r Ddeddf).