I recently declared war against the Ottomans, who among others have Aden as an ally. About a month before I could declare war Aden formed a coalition against me but no other states joined. I've almost fully occupied Aden and want to make peace, but the interface indicates I cannot make a separate peace with them because "a member of a coalition may never make a separate peace." Is this WAD? The war is not a coalition war and Aden is the head and whole extent of a coalition.