Rule 14.4 and the explanation is not enough to understand why

[misra-c]

MISRA-C introduces a strong typing model to help users avoid unexpected issues which occur in the C typing model.
The rule prevents the accidental use of integer expression when a boolean expression was intended.

To be compliant with MISRA rule 14.4 you should write your test as a boolean expression:

Code:

if((udtEvents & udtSTOP_EVENT) != 0U  )