I have noted two discrepancies between the NiA Rulebook rewrite 1.42 and the charts, and hope you can clarify these situations.
1) The charts show a -1 DRM for interception, whereas the rules indicate that the intercepting force gets a +1 DRM. What is the DRM and does it apply to just the attacker or defender?
Not sure what you mean here, there are several modifiers both for -1 and +1? Remember the intercepting player wants to roll 10 or more to succeed, positive mods help him, such as having a cavalry leader present, or having a better initiative value than his opponent. Negative mods hinder him, such as leading a mixed nationality Force.
2) The chart sequence for combat resolution doesn't list a supply check for the winner but 8.1 sequence includes 3. battle outcome step 3 to check attacker supply. Does the attacker have to check supply just at the beginning of activation, or are there additional checks after each field battle?
Supply checks are listed in 7.11.1 and at the end of a field battle is case c in that list. In 8.1.3.e you have attacker check supply.
If you are referring to my Activations and Battle play aid here on BGG that indeed does not list a supply check and that is clearly an oversight when I put that together.