Best way to validate infopath form - specific scenario

Question

I have this infopath form with 8 fields named:

Field1
Field2
Field3
Field4
etc.

How should I go to validate the form in a way that I cannot have duplicate values on those fields.

I cannot use code-behind because I dont have access to the central admin, plus a code-behind sandbox solution is too buggy for my like, keep getting random errors when publishing, using it. So I am looking for a no-code solution. I am using Sharepoint Server 2010.

Thanks

Answer 1

So I end up doing a full compare of all the possible combinations:

8 choose 2 = 28.

Thats a lot of rules. There is another limitation, one item cannot have more than 6 rules (or at least i thought so), looks like this limitation is only on the designer to overcome this limitation do the folloing:

In the Rule condition select expression and you can insert as many comparisiona as you want like:

. = ../my:Field2 or . = ../my:Field3 or . = ../my:Field4 ...etc

Answer 2

If you're wanting to just compare values to make sure there are no duplicates among them, you could create a validation rule on each of the fields that compares the values of each of the affected fields every time the value changes, and throws a validation error if duplicates are found.