Program can only be run in the background (see long text)

What causes this issue?

You cannot run this program online, as it is only processed in the
background.


&what_to_do&
You can either:

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Generate documents online
Generate documents for several allocation tables
From the Allocation menu, choose "Allocation table-> Generate follow-on
documents"
Generate documents for one allocation table
Choose "Allocation table -> Display" and then "Allocation table ->
Generate follow-on documents"
Generate documents in the background
Create a selection variant and run the program in the background or
schedule the program as a job.

Error message extract from SAP system. Copyright SAP SE.