def default_provenance():
    """The provenance for the default values.

    :return: default provenance.
    :rtype: str
    """
    field = TextParameter()
    field.name = tr('Provenance')
    field.description = tr('The provenance of minimum needs')
    field.value = 'The minimum needs are based on BNPB Perka 7/2008.'
    return field