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Hi Martin,
no, this information is not stored on the NAV/BC order, so it needs to be extended.
The Dynamicweb OrderId value is sent to NAV/BC but it is not stored on the NAV/BC order.
Once the order is created in NAV/BC its NAV/BC sales header number is sent back to Dynamicweb and stored in the OrderIntegrationOrderId column.

There is no identification that this is the Dynamicweb order in NAV/BC. You can do that once you extend the NAV/BC with custom Dynamicweb OrderId field.
Or you can use the Live integration "ERP controls shipping calculations" option and use/provide not blank the "ERP shipping item key" and send some value not equal to zero in the OrderShippingFee then you can filter the NAV/BC orders by finding the order order lines with Item charge assignment set to "ERP shipping item key".

Kind regards, Dmitrij