This option indicates if field level error indicators are to be displayed when an error occurs. The error message is the alt text of the image and is available as a tool-tip when the mouse is hovered over the image. The feature only applies to text input and date-time fields. Also, this feature only applies to web-tier generated messages (data-type validation, mandatory fields etc.), it does not apply to messages generated from server side code since there is no way to associate a server exception with a client side field.
<FIELD_ERROR_INDICATOR>true</FIELD_ERROR_INDICATOR>
Please note if the FIELD_ERROR_INDICATOR element is not specified, it defaults to FALSE.