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 6302                Parameter can only be a variable
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 Description
   This error occurs when a constant or an expression's result is passed
   to a function that receives this parameter by reference. The parameter
   in this case must be a declared variable. An expression, e. g. iNum + 3,
   can not be specified for the parameter.

 Solution
   Declare a variable that stores the passed value. Alternatively, use the
   const or value modifiers to pass an expression to a procedure or function.