function removeChange(oChange) {
			var sPersistencyKey = oChange.getSelector().persistencyKey;
			var mCompVariantsMap = FlexState.getCompVariantsMap(mPropertyBag.reference);
			delete mCompVariantsMap[sPersistencyKey].byId[oChange.getId()];
			mCompVariantsMap[sPersistencyKey].changes = mCompVariantsMap[sPersistencyKey].changes.filter(function(oChangeInMap) {
				return oChangeInMap !== oChange;
			});
			FlexState.removeDirtyFlexObjects(mPropertyBag.reference, [oChange]);
		}
Reverts the last operation done on a variant.

@param {object} mPropertyBag - Object with parameters as properties
@param {string} mPropertyBag.reference - Flex reference of the application
@param {string} mPropertyBag.persistencyKey - Key of the variant management
@param {string} mPropertyBag.id - ID of the variant
@returns {sap.ui.fl.apply._internal.flexObjects.CompVariant} The reverted variant