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Tasklet Integration works with single warehouse picks.
Do not combine multiple sales order lines with multiple shipping addresses in 1 warehouse pick. Booking of the shipment with TF result in a error.
Also be sure you set the Always on new transport order in the ShipIT on true. It’s not allowed to update existing transportorders with status NEW , especially with the combination of the WMS setup Booking actions set to “None” doublecheck if the Always new transportorder is enabled.