// username
if (userMod.getUsername() != null && !userMod.getUsername().equals(user.getUsername())) {
String oldUsername = user.getUsername();
user.setUsername(userMod.getUsername());
propByRes.addAll(ResourceOperation.UPDATE, currentResources);
for (ExternalResource resource : user.getResources()) {
for (AbstractMappingItem mapItem : resource.getUmapping().getItems()) {
if (mapItem.isAccountid() && mapItem.getIntMappingType() == IntMappingType.Username) {
propByRes.addOldAccountId(resource.getName(), oldUsername);