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Function is Correct, but Returns Incorrect Value when Called by SP

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Last Modified: 2020-02-25
A function returning a string does so correctly when calling it as stand-alone correctly returns:

EXEC EmployeeDietaryRestriction_SELECT_DietPerEmpID 184

Returns: 'Gluten-Free,Vegetrian,Vegan,' < correct

However, when called in an SP it returns a incorrect value:

EXEC @DietaryRestriction = EmployeeDietaryRestriction_SELECT_DietPerEmpID @EmployeeID --184

It Returns: '0' which is incorrect. It looks like a result code.

Why doesn't it work called from an SP? What am I missing here? Thank you for any help.
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