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ABAP Keyword Documentation → ABAP Glossary →Input/Output Parameter
Formal parameter of a procedure. When a call is made, the value of an actual parameter is passed to the input/output parameter. Its value can be set in the procedure to be available in the actual parameter at the end of the procedure. Input/output parameters are defined in methods, function modules, and subroutines using CHANGING. Therefore, they are also called CHANGING parameters.