SAP DIALOG MODULE documentation, setup help and example usage

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Dialog Modules
Dialog modules help prepare and process screens of the dynpro . You cannot declare local data types and data objects within a dialog module, whose functionality is implemented between the statements MODULE and ENDMODULE . All declarative statements in dialog modules belong to the global data declaration of the ABAP program and are visible in all following processing blocks. A dialog module works with the global data types and data objects of the framework program and therefore should not contain its own declarations.