Unexpected Duplicate Field Mapping Exception

Trying to generate entities with annotation mappings using the CLI orm:convert-mapping command will throw an exception.

– Schema to reproduce
CREATE DATABASE IF NOT EXISTS `doctrine_issue`;
USE `doctrine_issue`;
CREATE TABLE `activity` (
`idact` int(10) unsigned NOT NULL AUTO_INCREMENT,
PRIMARY KEY (`idact`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE `activity_log` (
`idacl` int(10) unsigned NOT NULL AUTO_INCREMENT,
`idact` int(10) unsigned NOT NULL,
PRIMARY KEY (`idacl`),
CONSTRAINT `fk_activity_data_activity` FOREIGN KEY (`idact`) REFERENCES `activity` (`idact`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

// configure a simple doctrine.php file to connect and run the following CLI command:
C:\>php doctrine.php orm:convert-mapping --from-database annotation .\Entities

Will throw an MappingException::duplicateFieldMapping on ActivityLog::idact, at line 1064 of class Doctrine\ORM\Mapping\ClassMetadataInfo