Hope this might be helpful:
The issue where "Quantity Shipped" isn't updating after posting a Sales Shipment directly from a Sales Order, but does update via Warehouse Shipments, strongly suggests it's due to custom extension code logic.
Standard Business Central behavior ensures "Quantity Shipped" updates correctly when posted directly from a Sales Order.
Recommendation:
If the "Quantity Shipped" field then updates correctly, it confirms that a custom extension is interfering with the standard posting process. You'll need to investigate that specific extension's code.
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