Maybe this is your problem:
It's fixed in version 1.2.5

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Betreff: [mantisbt-help] Enumerations with Empty Value
Gesendet: Mo, 27. Jun 2011
Von: Jon Hardcastle


We wanted to have a selection of values but have blank as a valid option so we set up an enumeration with the following:


But unless you select 1~20 it keeps reporting that the value must be provided... any clues?

MantisBT 1.2.4


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