modelForm validation -> model validation -> trigger field validation?

[Sven]

hi there,

has anyone of you an idea in which cycle the field method of
ForeignKey.validate is triggered?

I have a custom ForeignKey Field where i override the validate method.
So i expect that

ModelForm validation triggers
-> Model validation (clean methods) and this triggers
-> Field validation of all contained fields

But this seems not be the case. Has anyone of you an idea?

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Best Regards

Sven