# 2487 External Functions Not Working Correctly in SELECT WHERE Clause With Insensitive Result Sets

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I have created an external function in dll. That function returns Boolean (actualy it does not really matter). Function works just fine when I use it in SELECT statement. As the second parameter I use a field from the selected table. It suppost to be a value from a row. Which is good. When I am trying to use the same function in WHERE clause it doesn't work. Debugging shows me that the second parameter is the same all the time (actually a column from the first row in the table).