update c_invoiceline set m_inoutline_id = null
where exists (select 1 
              from m_inoutline ml
              where ml.m_inoutline_id = c_invoiceline.m_inoutline_id
                and c_invoiceline.m_product_id <> ml.m_product_id)
and c_invoiceline.m_inoutline_id is not null;