🕑 Inbound configuration
...
If an inbound attachment matches the entered patterns (ERP object ID and/or file type), it will be stored as defined in ‘Inbound configuration’. If no ERP object ID is entered, an entry will be relevant for all objects of a given file type (similarly, if only file type is entered, it will be relevant for all ERP objects).
Storage type in this customizing can also be set to 'E' - Do not store attachments of a given file/object type.
...
If this option is set, inbound attachment will not be saved and the attachment idoc will contain a log message ‘The message was marked as not needed and was not saved in the system’:
...
Company-dependent inbound configuration
Company-dependent inbound configuration has priority over the default Inbound Configuration and will be searched for first. Only if no matching pattern is found, other configurations will be searched.
...