This is because suppliers are expected to meet the highest standards of integrity in the supply and delivery of goods, services and works and to operate with openness and transparency.
Mae hyn oherwydd bod disgwyl i gyflenwyr gyrraedd y safonau uchaf o ran uniondeb wrth gyflenwi a darparu nwyddau, gwasanaethau a gweithiau a gweithredu mewn ffordd agored a thryloyw.