Not sure that it is in the code. I think just a 110.3(B) issue.
From the UL Guide Information for "Circuit Breakers, Molded Case and Circuit-breaker Enclosures (DIVQ)"
Line and load markings on a circuit breaker are intended to limit connections thereto as marked.
Thanks much.
I knew I had seen the documentation and was frustrated I could not find it in the NEC
I wish my memory was as extensive as my library where I found DIVQ.