SAP DATA OBJECTS BINDING documentation, setup help and example usage

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Binding of Data Objects to Formal Parameters and Field Symbols
Currently data objects are bound to the formal parameters in subroutines , function modules and methods at runtime. Bound formal parameters behave like locally visible variables with automatic validity.
Data objects are also bound dynamically to
FIELD-SYMBOLS . Bound field symbols behave like local or global variables, depending on whether the field symbol has been defined locally or globally.