How to merge two different documents?

Athento SE allows you to merge two documents into a single PDF. 

In order to do so, you need to enable the operation "Concatenate related documents" on your series or app.

Basically, the operation merges two documents that:

• Belong to the same document form or type
• Are in a PDF format
• Share the same value for a key field (key_metadata)

The operation also allows you to define which document of the two will be considered the primary. In the example, the newest document is merged into the oldest one. 

The document that was merged into another is marked as "merged".