Change in PO Qty does not reflect to the sales order

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Hi All,

I have a requirement like to place a Purchase Order on the supplying plant with a Value Pack Item, when user want to change the PO quantity ( after Sales order created for the same PO), it does not reflect back to sales order.

Here is the steps for this scenario. First I have created a Purchase Order, then created a Sales Order for the same. Now if the user wants to change the PO quantity, it results in error in IDoc.

If we check the same in IDoc, it has an error like "Field VBEP-WMENG is not an input field". And when I checked the delivery in VA02 (the Shipping tab on the Overview screens), the schedule lines are greyed out. This is the reasons why the error occurs.

Can somebody give a proper solution to overcome this issue. Thanks in advance.

Regards,

Murphy