Events triggered by validation of game variables, and relationship level is just one of them, there are conditional flags that track quest progression against bracket values for relationship. Quest flags are incremental tracking story progress with each character unlike relationship, that may fluctuate. Therefore if relationship is accelerated trough cheat console, it may cause that conditions for specific quest id, does not fit into relationship range allocated for that quest. As a result, quest completion event can’t be triggered. Walk trough mentions maximal relationship levels required to proceed with events announced in each incremental update.