Pages can be moved during the document assembly as well.
What it does
The handler of this event can be used if you need to do some manipulation on the new document based on the source documents, for example, to save the merged registration parameters. If one document is fully embedded into another one, then in the Pages array its pages will go in succession and in the same order as they go in the target document.After merging pages the layout of the target document can change.
When it is launched
The script is launched prior to moving pages from one document to another.Parameters
* - The internal field requires loading the object into memory.