Hi Robbie,
Like Shilpa Uppund said, I think it might be that ou are trying to create a record in the entity, but this entity (ROOMSERVICE) has a mandatory Foreign Key (ROOMSERVICE TYPE) that likely is not being provided, or the value provided does not match one in the RoomServiceType entity.
Check your action flow and see what information you are passing for the RoomServiceType of that record.
Hope it helped,
Clarisse