VM import from export storage domain fails.

Issue

VM Import from export storage domain is failing with error:

General command validation failure

and in engine.log there

engine.log-20160625.gz:2016-06-20 08:00:38,509 ERROR [org.ovirt.engine.core.vdsbroker.irsbroker.IrsBrokerCommand] (ajp-/127.0.0.1:8702-7) [6fe78db3] ERROR, GetImagesListVDSCommand( GetImagesListVDSCommandParameters:{runAsync='true', storagePoolId='b7cafba4-83d4-4bdc-a9a4-c4a8f22442fc', ignoreFailoverLimit='false', sdUUID='9b53b2a6-e4ad-485d-b63d-1af5048da040'}), exception: For input string: "file.ext", log id: 5711a97e
engine.log-20160625.gz:2016-06-20 08:00:38,511 ERROR [org.ovirt.engine.core.vdsbroker.irsbroker.IrsBrokerCommand] (ajp-/127.0.0.1:8702-7) [6fe78db3] Exception: java.lang.NumberFormatException: For input string: "file.ext"
engine.log-20160625.gz:2016-06-20 08:00:38,547 ERROR [org.ovirt.engine.core.bll.ImportVmCommand] (ajp-/127.0.0.1:8702-7) [6fe78db3] Error during CanDoActionFailure.: org.ovirt.engine.core.common.errors.EngineException: EngineException: java.lang.NumberFormatException: For input string: "file.ext" (Failed with error ENGINE and code 5001)