People using the export UI's forms don't really have any idea what characters are allowed in the key until they submit the form and get a validation error. This adds that information to the description.

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japerry’s picture

Issue summary: View changes
Status: Needs review » Closed (outdated)

Closing this issue as outdated as Drupal 6 ctools is not supported. If this issue is relevant for Drupal 7, feel free to re-open and mark for Drupal 7 (or 8)