According to SAP ‘indirect access’ is a term (beware: a term, not a definition !) for: “SAP data use by an end user or by an application, which is not via SAPGUI” and then SAP points to the System Measurement Guide.
In this System measurement Guide the named user is defined in article 1.2 and there is also a paragraph about indirect use:
Named users primarily use the SAP software. Users from upstream or interposed technical systems require licenses as named users if they exchange information with the software in dialog or prompt mode, regardless of whether the software is accessed directly or indirectly.
Indirect access means that the user is communicating with a system upstream from the SAP software that transfers communication activities to the SAP software installation or otherwise accesses the SAP software or uses its functions.
In particular, the following are examples of indirect use: (more…)