Minimum Purchase Error

Product:Quantity:Price:Total:FE-204- Caterpillar 3196 Single Turbo, Size 12" Diameter x 10" Tall Strait1  (Error)$14.50$14.50FE-190 Caterpillar 3208 425/435 hp Single Turbo, Size 7 1/2" Base Diameter x 10" Tall Cone1  (Error)$13.50$13.50FE-195- Caterpillar 3208 375 hp Single Turbo, Size 7 1/2" Base Diameter x 8" Tall Tapered Cone1  (Error)$14.00$14.00FE-3304 Caterpillar 3304 Generator air filter, Size 9 1/2" Diameter x 6 1/2" Tall Strait1  (Error)$12.50$12.50FE-204- Caterpillar 3406E, Size 12 1/4" Diameter x 10 1/2" Tall Strait1  (Error)$14.50$14.50FE-305- Caterpillar 3208 305 hp, Size 5 3/4" Base Diameter x 9 1/2" Tall Cone Shape1  (Error)$13.50$13.50Error => Minimum Purchase quantity of 6 units required of each product within the product group. (Rule ID = 541)