Gan ddefnyddio Rheoliad 20 o'r Rheoliadau Contractau Cyhoeddus (2015), hysbysebir y System Brynu Ddeinamig arGwerthwchiGymruar sail neilltuol. Dim ond sefydliadau sy'n cael eu dosbarthu fel gweithdai cyflogaeth cysgodol a all wneud cais am le ar y System Brynu Ddeinamig. Gellir diffinio gweithdy cyflogaeth cysgodol fel busnes sydd ag o leiaf 30% o gyflogeion sy'n cael eu hystyried yn weithwyr anabl neu ddifreintiedig.
Utilising Regulation 20 of the Public Contracts Regulations (2015), the DPS is advertised onSell2Waleson a reserved basis. Only organisations that are classified as a sheltered workshop may apply for a place on the DPS. A sheltered workshop can be defined as a business that has a minimum of 30% of employees that are classed as disabled or disadvantaged workers.