SAP DIALOG MODULE

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Dialog Modules
Dialog modules help prepare and process screens of dynpros. No local data types and data objects can be declared within a dialog module whose functions are implemented between the following statements: MODULE
...
ENDMODULE
All declarative statements in dialog modules are global data declarations of the ABAP program and are visible in all subsequent processing blocks. A dialog module works with the global data types and data objects of the compilation unit and should therefore not contain its own declarations.