[Flow] Object Validation

[Dirk Rauscher]

Hi everybody
I'm wondering about an Object Validation issue.
I expected Flow to be able to handle Object Validation by means of a Validator named equally to the object's class it will be used for.
Class name:                MyClass
Validator name:               MyClassValidator
So far it's clear. But where has this validator to be located? So far I tried the following paths but either of them didn't make the Validator react during a create- or updateAction call
My\Package\Domain\Validator
My\Package\Validation\Validator
My\Package\Validation
As far as I know in TYPO3 CMS the Object Validators have to be located in My\Package\Domain\Validator due to a bug.
Is there a similar issue in FLOW? Where do I have to put the Object Validators to be "activated"?
I'm using Flow version 2.3.5
Cheers Dirk