I agree with Martin on this. It is also useful to include some remarks on corrective action, e.g., “ARMCD(s) of [A], [B] are in DM, but not found in TA; confirm they are special arm codes assigned to subjects who did not complete the entire planned arm path”.
HTH,
Anthony
Disclaimer: The opinion expressed above is made (a) based on the information provided and may or may not be the most effective solution and (b) in my personal capacity and not in the capacity as a staff of my employer.