There are two ways to have AGR consider open sales orders as part of demand.
Special Order item in AGR - the Total Demand for Special Order items in AGR is driven by Open Sales Orders only. Mark an item as a Special Order Item in the Item info sidebar or mark the item with a value of Order in the Reorder Policy field (in BC).
2. Use the Sales Orders settings in the Orders tab of Settings to tell AGR how it should treat sales orders.
In case you have drop-shipped sales order, from vendor to customers. AGR does not distinguish from open sales orders marked as drop shipped from your ERP system. all open sales orders will trigger demand if the 'always' setting is used, and if the sales orders are higher than the forecast when the 'conditional' setting is used.