Use RAMSession.put(IRAMSessionObject, IProgressMonitor) to commit changes to a new or updated global asset attribute object. Only a repository administrator can create global asset attributes.
//Update Name, Description and valid values
newAssetAttribute.setName("Updated Asset Attribute Name");
newAssetAttribute.setDescription("Updated Asset Attribute Description");
newAssetAttribute.setValidValues(new String[]{"value 3", "new value"});
newAssetAttribute.setSingleSetting(true);
session.put(newAssetAttribute, new NullProgressMonitor());