public void DemandsAdd(Demand demand)
{
if (demand.GetType() == typeof(ProductionOrderBom))
{
_productionOrderBoms.Add((ProductionOrderBom)demand);
}
else if (demand.GetType() == typeof(StockExchangeDemand))
{
_stockExchangeDemands.Add((StockExchangeDemand)demand);
}
else if (demand.GetType() == typeof(CustomerOrderPart))
{
_customerOrderParts.Add((CustomerOrderPart)demand);
}
else
{
throw new MrpRunException("This type is unknown.");
}
}