Hi,
This feature is not available for now. For now, please create Github Issue for suggesting this feature.
Some work-arounds which will help you continue using ERPNext.
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In the Production Order, do not update Sales Order ID.
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Create Production Order for item for same Qty as in SO. In the Manufacturing Settings, update “Allow Over Production Percentage”. This will allow you to create Manufacture Entry of more than Production Order qty.
Hope this helps.