My brain “froze” and I can’t find the answer in any BMC examples. In the attached file, am I required to indicate the flat for the interval of a seventh (highlighted)? If the attachment doesn’t “send,” I’ll be more specific in a follow-up email.
You’re not required to restate that flat on the second chord, as long as you haven’t divided the measure. If you divide, restate it, but otherwise, the reader should remember that the A was flatted at the start of the measure.