Nancy, it was just a snippet. here's the whole function:

CREATE FUNCTION [dbo].[fnConcatUserComplaints] (@UserId int)

RETURNS varchar(8000)

AS BEGIN

DECLARE @strReturn VARCHAR(max)

SET @strReturn = ''

SELECT @strReturn = @strReturn+ ComplaintDetail+ char(13)

FROM ComplaintsTable

WHERE UserId=@UserId

RETURN @strReturn

END