Error while creating a function in HANA

I need help with an error that comes after I do a select statement for a function that I created.

This is the function

CREATEFUNCTION"PTIRUCHANUR"."ufnGetAllCategories"(retCategoryInformation INT)

RETURNS table (

   "PARENTPRODUCTCATEGORYNAME"NVARCHAR(50) ,

    "PRODUCTCATEGORYNAME"NVARCHAR(50),

      "PRODUCTCATEGORYID"INTEGER

)

LANGUAGE SQLSCRIPT

SQL SECURITY INVOKER AS 

-- Returns the CustomerID, first name, and last name for the specified customer.

BEGIN

      RETURN  Select

      "PARENTPRODUCTCATEGORYNAME",

      "PRODUCTCATEGORYNAME",

      "PRODUCTCATEGORYID"

      from"PTIRUCHANUR"."VGETALLCATEGORIES"

      Select * from "PTIRUCHANUR"."ufnGetAllCategories" ('5')

    where  :retCategoryInformation = "PRODUCTCATEGORYID";

END;

The error that I get when I do

Select * from "PTIRUCHANUR"."ufnGetAllCategories" ('5')

is as follows

Could not execute 'Select * from "PTIRUCHANUR"."ufnGetAllCategories" ('5')' in 44 ms 838 µs . SAP DBTech JDBC: [2048]: column store error: search table error:  [34092] search on calculation model requires parameters;Required variable $$retCategoryInformation$$ is not set.

Please help me with this.

Thanks.