EDI ORDRSP Sales Order Confirmation Failed Idoc

[TMASaphir]

Hello Experts,

I am implemeting SD/MM PO/SO integration with EDI Idoc ORDERS.

The sales order can be created correctly using the Idoc ORDERS but the confirmation ORDRSP inbound idoc has the error status 51 : Acknowledgment for PO item ... contains quantity variance.

After debugging, it seems that the ATP check is not triggered that's why there is no confirmation quantity at sales order level.

If I run the Tcode V_V1 on the sales order, the ATP check is done and the inbound idoc ORDRSP can be integrated successfully to status 53.

Do you know how I can trigger the ATP check at the same time or just after the sales order get created with idoc ORDERS?

Thank you for your help

Best regards,

Christophe