When processing through TechShip Desktop Client or through the Web Client you might come across the "Duplicate open or closed picks #### found for XXXX" (Desktop Client) or "Failed to fast import: Duplicate open or closed picks #### found for XXXX" (Web Client) error.
This error happens because the order you're trying to import under that pick number has already been imported into the system.
The status of that order could be open or closed.
To fix this issue, if you have to process the order again, you will have to delete the order previously imported from techShip and import and process again.