I have 2 coupons :
The black coupons and the rest of the coupons on my siteare the white coupons.
These rules need to be exist:
1. Each black coupon can be valid with white coupons
2. A black coupon cannot be valid with a black coupon.
This is the third time I ask for your help On this subject, I hope this time I was able to explain myself
In reality blacks are coupons given to vendors who market my business and the rest of these coupons are regular coupons on the site.
Thousands of thanks and admiration for your patience and help