Regarding direct updates to tables such as MARD and MARA: Please cover the risks involved when creating customized programs that execute direct updates to tables (for example, loss of history on changes etc).
You basically don't change any tables if you don't have a good understanding of what other related tables will be affected. MARA has so many links to other tables that an incorrect change may cause data loss or problems in the application. If you're doing simple selects then you're fine but an update is a different story. Please check with SAP about your custom programs and their purpose on the system because they will give no support if a problem happens in the system due to a direct table update via a non-standard program.
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