(is_int(this.NAOK) and this.NAOK ge 0 and this.NAOK le 100) OR is_empty(this.NAOK)
Assistance on LimeSurvey forum and LimeSurvey core development are on my free time.
I'm not a LimeSurvey GmbH member. -
Professional support
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Plugins, theme and development
. I don't answer to private message.