[C con Clase] que significa el error Conversion loses qualifiers ???

[David Fire]

archivo.cpp : error C2662: 'DeliveryData::CheckTicketDeliveryAlarm' : cannot
convert 'this' pointer from 'const DeliveryData' to 'DeliveryData &'
        Conversion loses qualifiers

          DeliveryData   *deliveryData = &(pTank->m_DeliveryData);
en esta linea lo tira        deliveryData->CheckTicketDeliveryAlarm(
pTank->getDeviceID() );

esto da el mismo error
          DeliveryData   &deliveryData = pTank->m_DeliveryData;
en esta linea lo tira        deliveryData->CheckTicketDeliveryAlarm(
pTank->getDeviceID() );


pero esto si funciona
          DeliveryData   deliveryData = pTank->m_DeliveryData
         deliveryData.CheckTicketDeliveryAlarm( pTank->getDeviceID() );

alguna idea???
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