Don't know if it answers any question, but the measure nesting is incomplete to begin with, it should be [&mD[&mDay]] or [&mD[&mDay:]:] - whichever you prefer. As for the initial 0, if that's still a thing after the correction, it might be because of the measure getting its value later on during the workflow in the skin.
Statistics: Posted by Yincognito — Today, 12:52 am