InfoPath Dev

I am looking for two solutions.  I am wanting an id number to display on a repeating table and increment by 1 each time a new row is add.  When the next number is greater than the previous number, I want it to disable a comment field for that previous value. 

Save the attached file locally, right click the saved file and select Design. Then you can preview and check it out.

 Thanks Hilary.  I was able to get the incremental value added and I copied your disable rule.  I am missing why my table isn't disabling the previous value, but yours is.  I have attached the file back to this email with my table.

If you click edit XPath on my formula, you'll see: xdMath:Max(../my:group2/my:field1) - but on your formula, you have: xdMath:Max(my:field3). You need to go back up the tree so that you are getting the max of all items in your group. So - your formula would be: xdMath:Max(../my:group4/my:field3). Make sense? That's because you need to look at all the field3 values, not just the one for the current row.

 Awesome.  That worked like a charm.  I was also able to add the same rule to the table and users are not able to delete the previous field.  Thank you very much.