def METHOD_NAME(self, MetaQueryDict):
    """Check the format query and transform all dict values in dict for uniform treatment
    :param dict MetaQueryDict: a dictionary of the MetaQuery
    """
    for meta, value in MetaQueryDict.items():
        values = []
        if isinstance(value, dict):
            operation = list(value)[0]
            if operation not in ["=", "in"]:
                msg = f"Operation {operation} is not supported"
                return S_ERROR(msg)
            else:
                if not isinstance(list(value.values())[0], list):
                    MetaQueryDict[meta] = {"in": list(value.values())}
        else:
            values.append(value)
            MetaQueryDict[meta] = {"in": values}
    return S_OK(MetaQueryDict)