One coupon per offer???

Ok, I have never seen this before. I was heading out the door to use my Chef Boyardee coupons (.50 WUB2) and I noticed that the top corner says "limit one coupon per offer". Does this mean one per purchase, or one per transaction? I just know zellers will give me a hard time with these. I wonder if it's worth trying WM or not. I would have to take the bus there so it has to be worth it for me ;)

I guess I kind of answered my own question today. I went to Zellers and I was able to use my coupons with no issues. I figured that one per offer, was the same as one per purchase. The cashier agreed so it was good for me LOL.