RequiredIfOtherFieldEquals validator and FileField

I am trying to use RequiredIfOtherFieldEquals in the
validator_list  
of a FileField and have run in to a problem: When editing an
existing  
object in which the FileField is already populated and no
file is  
chosen for upload validation fails as there is no
field_data.

Is there any way that I can make a validator as a model
method so I  
have access to the instance or is there another way around
this?

Thanks for any help,
Arthur

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