Unable to import data that includes installations

When importing builds.xml data into 1.3.1, I get the following error:

ERROR 23505: The statement was aborted because it would have caused a duplicate key value in a unique or primary key constraint or unique index identified by 'INSTALLATION_PK' defined on 'INSTALLATION'.

To reproduce, create a 'backups' directory, save the attached builds.xml file into it, and execute:

java -Xmx512m -jar data-management-cli-1.3.1-app.jar -buildsJdbcUrl jdbc:derby:/path/to/apache-continuum-1.3.1/data/databases/continuum/ -mode IMPORT -directory backups

The attached builds.xml was exported from a Continuum 1.2 instance using data-management 1.2.3.1.

If you edit builds.xml and delete the <installations> ... </installations> then the import will complete without error.