the underlying cause of the difficulties between the Main Character and the Impact Character
Less the source of a problem between them and more a motivator towards engaging in the relationship, the Relationship Story Problem brings Main and Influence Character together. Whether or growing or dissolving relationship, this Problem continues to motivate interaction until the story ends or until their relationship resolves with the Relationship Story Solution.
Relationship Story Problem
This is the actual source of the inequity between the Relationship Story Throughline Characters which lies at the level of their motivations. Only by applying the Relationship Story Throughline Solution can the effects of this inequity finally be dealt with.