ATP Check for STO outbound delivery

Hello Experts,

                            I have one query; we have created outbound delivery with respect to sales order and run the Availability check in VL02N (change mode) system is not consider the Outbound delivery quantity and propose the cumulative quantity. Whereas outbound delivery created with respect to stock transfer order, and we run the availability check in VL02N system is considered the Outbound delivery quality also as confirmed therefore cumulative quantity shows less quantities.

        SAP S/4HANA for advanced ATP 

Example:

Sales order generated outbound delivery.

                        Available stock 100 Kg

                        Outbound delivery 30 Kg

                        When we run the ATP in VL02N for this outbound delivery – Cumulative quantity shows as 100 Kg.

STO generated outbound delivery.

                         Available stock 100 Kg

                         Outbound delivery 30 Kg

                        When we run the ATP in VL02N for this outbound delivery – Cumulative quantity shows as 70 Kg.

My requirement is STO generated outbound delivery ATP run  also should propose 100 kg as cumulative quantity.

Thanks in advance,

Nagaraj