Transaction for Table Maintenance Generator is
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sm30
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/nn
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sap_maintain
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All the Above
SM30 is the SAP transaction code for the Table Maintenance Generator, which is used to create and maintain table views for custom tables. This tool allows users to create, edit, and display data through views. The other options (/nn and sap_maintain) are not standard SAP transaction codes.
SM30 is the standard SAP transaction for the Table Maintenance Generator, used to create, edit, and maintain data in customizing/configuration tables through a generated maintenance dialog (view). '/nn' is not a valid transaction code (it looks like command syntax for exiting/navigating transactions, not a TMG tool), and 'sap_maintain' isn't a real SAP transaction code at all. Since neither alternative is valid, 'all the above' is also incorrect — SM30 stands alone as the correct, well-documented SAP transaction for this purpose.