"api-tests" (2.7.1) tests do not set 'Version' header during the REST calls to the MANO.
The test-cases should pass on the 'Version' HTTP header while making REST calls to MANO, as per SOL003, 005, 002 specs. Attahed is a screenshot from SOL013 which describes the parameters, details etc while making REST calls.
As per the spec, any API-client that intends to call SOL APIs for versions beyond 2.5.1, "shall" provide the 'Version' HTTP header.