InfoPath Dev

Double eval doesn't seem to be the issue -- it's the addition of the [not(. = preceding::*)]. The Design Checker doesn't actually say much of anything -- it only includes a couple items: 1) Data connections contain parameterized queries and 2) Could not verify the form template on the specified server. Strangely, when I revert back to ...

Correction: I can't seem to publish a web form with the formula above -- when publishing, I get an error that the form can only be published as a Filler form. Is this kind of formula not compatible with web forms? (This is in SharePoint Online, fwiw.) Thanks for any help you can provide.

So I tried this: substring((eval(eval(FieldName[not(. = preceding::*)], 'concat(., "; ")'), "..")), 0, (string-length(eval(eval(FieldName, 'concat(., "; ")'), "..")) - 1))  enabled form ... is this formulation not allowed in browser forms?  Thanks,  Tyler 

 Jimmy, can you revisit this with a bit simpler example please? I don't have the nested repeating fields, but still want to remove any duplicates. My aggregate formula looks like this: substring((eval(eval(FieldName, 'concat(., "; ")'), "..")), 0, (string-length(eval(eval(FieldName, 'concat(., "; ...