Because all characters in your dream are you, if you are in agreement with someone in your dream, then this represents inner synergy. Consider the feeling tone of the dream, and whether you are agreeing submissively or willingly.
Look out for some careless oversight which may be detrimental to your immediate plans if your dream concerned an agreement, but if you actually signed the document in your dream, then guard against a financial setback. ... The Bedside Dream Dictionary