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Micro Focus Enterprise Developer 3.0 for Visual Studio 2013 > General Reference > Error Messages > Syntax Checking Error Messages > COBCH1601 - COBCH1700 > COBCH1621 - COBCH1640 > COBCH1640 Optional parameters cannot be specified with BY REFERENCE OUTPUT...

COBCH1640 Optional parameters cannot be specified with BY REFERENCE OUTPUT or PARAMS

A reference or output parameter has been declared as optional.

You can only pass an optional parameter BY VALUE. 

class-id myClass.
method-id Method1.
procedure division using by reference s1 as string = "Hello".
... 
end method.
end class.
Parent topic: COBCH1621 - COBCH1640
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