can u post your solution to help others pls?
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Sorry for my late answer
Solution:
add to my /lib/form/doctrine/myclassFrom.class.php
$this->widgetSchema['contractor_id
']->setOption('table_method','getContractorByCredentials');
and to /lib/model/doctrine/contractorTable.class.php
for example
public function getContractorByCredentials()