It looks there is missing confirmation line in the order (line with committed (ecc)/confirmed (apo) quantity). This line is create during ATP check. Please check your ATP check setup for the material and also check whether there is situation so that ...
When a sales order is confirmed in ATP check, usually there is no "relationship" created between the sales order and receipts. In APO system, Pegging describes the relation between requirements and receipt elements. Pegging is calculated in Livecache...