When building their individual grid models (IGMs) as input for the common grid model (CGM), TSOs have to use a consistent set of balanced net positions and balanced flows on DC lines. Otherwise the load flow calculation will not converge and it would not be possible to build a (usable) CGM. For those target time horizons for which market schedules are available (day-ahead and intraday) the schedules provide the information required. However, for some target time horizons, notably (D-2) and (Y-1), schedules are not available. The CGMA IT platform makes it possible to provide TSOs with a set of balanced net positions and balanced flows on DC lines even for those target time horizons for which market schedules are not available.