I'll try to help, but my knowledge is limited to the documentation of the module (Data::FormValidator). It seems that dependency groups are just what you need: 

dependency_groups  => {
    # if either field is filled in, they all become required
    course_group => [qw/f_course f_month f_year/],
}

[download]

Regards,
Luke

In reply to Re: Need Help on Dependencies using Data::FormValidator by 1Nf3
in thread Need Help on Dependencies using Data::FormValidator by soon_j

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