Minimum Purchase Error

Product:Quantity:Price:Total:FE-184- GM Detroit 8V92 Single Turbo 6062TK20 60 series 375hp, size - 9″ Base Diameter x 14″ Tall cone1  (Error)$15.50$15.50FE-196- GM Detroit 8V92 dual turbo DDC, Size - 9″ Base Diameter x 9″ Tall cone shaped1  (Error)$15.00$15.00FE-195- GM Detroit 471 Natural, size - 7 1/2″ Base Diameter x 8″ Tall cone1  (Error)$14.00$14.00FE-177- 12V71 Detroit, size - 7 1/2″ Diameter x 9" Tall cylinder shaped2  (Error)$13.50$27.00FE-195-4V35 GM Detroit 4V53 Single Turbo, size - 7 1/2″ Base Diameter x 8″ Tall cone shape1  (Error)$14.00$14.00FE-196- GM Detroit 871 Natural, size - 9" Diameter x 9" Tall cone shaped1  (Error)$15.00$15.00Error => Minimum Purchase quantity of 6 units required of each product within the product group. (Rule ID = 541)