Deductions & credits

My apologies for asking the same question twice.  I couldn't find the question again the first time, and I even seem to have 2 different profiles now.  My question is here

https://ttlc.intuit.com/community/tax-credits-deductions/discussion/deduct-credit-card-convenience-f...

and here

https://ttlc.intuit.com/community/business-taxes/discussion/re-if-my-business-goes-on-a-schedule-c-o...

and I got two opposite answers.  I'm not sure how to proceed.