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Integer fileds can accidentally be entered with 'Out of range' error. This time a user has no other option but to click back button. Any suggestions on templating these kinds of errors or for any other errors of the same nature?

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What? ... add a custom FAPI validator to your forms so there is no out-of-range error.

You could build on, or start off by using: http://api.drupal.org/api/drupal/includes%21form.inc/function/element_validate_integer/7

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