Here you can learn about the steps to add the PO number in shipment.Step 1: Login with Fresa Gold, Navigate to particular Shipment. (Fig.1)
Step 2: In the Shipment Details, Click the Reference on the left. (Fig.2)
Step 3: Add reference type as PO number and add the reference number then click save button. (Fig.3)
Step 4: Now the PO number is added in the shipment (Fig.4)
The above blog post explains about the steps to add the PO number in shipment.
Also further you can watch the below demo video for How to add the PO number in Shipment in Fresa Application