I have an application that looks for data in another file's element called CodeNo.  I'm currently using a @xlu statement to get data based on the value I enter into an element (call it CheckerElement) on my main form.  It works great but I'm concerned about someone entering in a number in CheckerElement that doesn't exist in CodeNo.

I'm trying to manipulate my application performance based on the presence of a CodeNo in the other file.  CodeNo is a number and I want to make sure a number I add in an element in my main file is present in my other file.

Is there an easy way to check if a CodeNo is present in the other file?  For example, if the CodeNo element includes 1,2,3,4,5,6 and I enter 22 in CheckerElement, what does the @xlu statement return?