Oh come on now...
https://www.dealsplus.com/special-offers/p_sports-authority-coupon-20-off-1-item

It's a good question. I've experienced this before. I'm not sure why anyone is thumbing you down:/

I thumbed you up though;)

@LokaFreeThings2 Thanks, I appreciate the response. Just worried you'll get thumbed down because of me though. And this response I'm currently typing will probably get the same 3 thumbs down that the others had :-P

I have always posted the coupon and it didn't arise, but if you post a deal which includes the coupon, the coupon will be automatically added.Just my experience.

ive asked a mod the same question but never heard back. It was for CVS and I got the message of not allowed but saw someone else later added it.I got no response to if this was allowed so I went ahead a few days later and posted one of my own.
I try to follow all the protocols and when unsure I ask a mod,in this instance I received no reply and the other persons post was never deleted so I went ahead and posted.
Hopefully this question will be answered if a mod sees these posts.