how to receive the field value in validator function?

[cmadmin]

Hi:

I want to get the customize field’s value in Bug.pm,
For example I create a field with named cf_orientation and cf_location,
If the value of cf_orientation is Plat and status in Resolved then the cf_location should not be null,
I check the cf_location in the validator function sub _check_cf_location
 , in which I get the value of cf_orientation by the following:
my $orientation =  blessed($invocant) ? $invocant->cf_orientation : $params->{cf_orientation};
but I can not get the value, the $orientation is null (---),
Only I update the two field sortkey, that the sortkey of cf_orientation is smaller than cf_location,
The value of cf_orientation can receive in the _check_cf_location
I don’t know why, and cannot find the reason in bugzilla document.
Could you tell me the root-cause ?
Thank you very much

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