Product: Dynamics Business Central
In order to import an Advance Ship Notice (ASN) into Transaction Manager from Business Central - you'll first need to package your Shipment within Business Central into an ASN.
This is the process of taking the items that have shipped (the Shipment) and generating a structural document (e.g SOI or SOPI) that let's the Trading Partner or Carrier know how your product has been packaged for shipping. Unfamiliar with ASN Structures? Check Out this Article
Viewing Your Shipments Package Details (ASN Structure)
In order to see how your Shipment was packed - you'll need to pull up the Package Details section of the shipment within Business Central
Within Business Central - open up your Shipment and locate the Related→ TC Package Detail option
Package Details (ASN Structure)