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Hi,
I try to do a custom validation on the model "Form Validation API" found on https://www.drupal.org/node/1324772
The hook 'mymodule_fapi_validation_rules' is never called !
Conflict with other module ? field_validation ? multistep ? field_collection ? conditional actions ?
My form is huge and complex.
The 'standard' clientside validation works fine, but impossible to make custom validators !