SAP NetWeaver AS ABAP Release 740, ©Copyright 2014 SAP AG. All rights reserved.
Pass by Reference Is Standard for Methods
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In contrast to function modules, pass by reference is the standard for interface parameters of methods.
To pass a parameter as value, p must be defined instead of the name in the interface definition VALUE(p). Only the passed value is allowed as the return value
(RETURNING parameter).
Reason:
Pass by reference is more efficient than passing the value.