Coupon creation problem

[volemax]

Please help me.

I need to create coupon for specific product directly in DB.

I write one record in ss_Coupon and one record for the product in ss_CouponToProducts. But when I look at created coupon in backoffice, it is for specific products but does not have products assigned.
I write correct coupon id in ss_CouponToProducts and correct product id.
I think that is not enough to write the record into ss_CouponToProducts. There should be something else.

Thanks in advance.