I have only one army in a region, and it is connected to a supply line by a grain pit in an adjacent region. Currently, it is not experiencing attrition. Why then is the region my army occupies showing a supply consumption resulting in a negative regional supply status? Is it because the army first consumes it's regional supplies, and when those supplies are gone, it's then supported by the supply line? Or, should the fact that it is connected to a supply line preclude any consumption of regional supplies at all?
Thanks