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ABAP Keyword Documentation → ABAP Overview → ABAP and Unicode → Differences between Unicode and Non-Unicode Programs →Function Module Calls in Unicode Programs
In Unicode programs, a handleable exception is raised in a general function module call if an incorrect formal parameter is specified and the name of the function module is specified using a constant or as a literal. If the name of the function module is specified by a variable, and in non-Unicode programs, the specification of an incorrect formal parameter is ignored.