def METHOD_NAME(env, target=None, source=_null, **kw):
    """ Wrapper for `POUpdate` builder - make user's life easier """
    if source is _null:
        if 'POTDOMAIN' in kw:
            domain = kw['POTDOMAIN']
        elif 'POTDOMAIN' in env and env['POTDOMAIN']:
            domain = env['POTDOMAIN']
        else:
            domain = 'messages'
        source = [domain]  # NOTE: Suffix shall be appended automatically
    return env._POUpdateBuilder(target, source, **kw)