loadFlexData(mPropertyBag) {
			mPropertyBag.cacheable = true;
			return this.sendRequest(mPropertyBag).then(function(oResponse) {
				oResponse.changes = oResponse.changes.concat(oResponse.compVariants || []);
				return oResponse;
			});
		}
Loads flexibility data from a back end.

@param {object} mPropertyBag Further properties
@param {string} mPropertyBag.url Configured url for the connector
@param {string} mPropertyBag.reference Flexibility reference
@param {string} [mPropertyBag.version] Version of the adaptation to be loaded
@returns {Promise<object>} Promise resolving with the JSON parsed server response of the flex data request