/**
  * Fetches all references that need to be considered during the MT940 import process, e.g.
  * all open client billings/invoices that have not yet been linked to other bank transactions
  * 
  * @note A dummy implementation of <code>org.nuclet.mt940.logic.AbstractMt940Logic</code> has 
  * been  provided with this class here, its methods are meant to be implemented with user 
  * specific behaviour.
  * 
  * @return all references that need to be considered during the MT940 import process; the return
  * value comes as as <code>Map</code> in which the <code>BusinessObject</code> represents the
  * map's key while the text, which is meant to be used to link the reference to a bank
  * transaction, represents the map's value
  * 
  * @throws BusinessException might be thrown in case of errors or other exceptions
  *
  */
 public Map<BusinessObject, String> getReferences() throws BusinessException
 {
     final HashMap<BusinessObject, String> mpReferences = new HashMap<BusinessObject, String>();
        
     final Query<ClientBilling> qryGetReferencesStateAB = QueryProvider.create(ClientBilling.class)                             
		.where(ClientBilling.NuclosState.eq(ProcessClientBillingSM.State_AB.getId()))
		.and(ClientBilling.Facturated.eq(Boolean.FALSE));

     final List<Rechnung> lstReferencesStateAB = QueryProvider.execute(qryGetReferencesStateAB);                
     
     for (final ClientBilling clientBilling : lstReferencesStateAB) {
         mpReferences.put(clientBilling, clientBilling.getBillingNumber());
     }
     
     final Query<ClientBilling> qryGetReferencesStateXY = QueryProvider.create(ClientBilling.class);                                
	     .where(ClientBilling.NuclosState.eq(ProcessClientBillingSM.State_XY.getId()))
		 .and(ClientBilling.Facturated.eq(Boolean.FALSE));

     final List<ClientBilling> lstReferencesStateXY = QueryProvider.execute(qryGetReferencesStateXY);                
      
     for (final ClientBilling clientBilling : lstReferencesStateXY) {
         mpReferences.put(clientBilling, clientBilling.getBillingNumber());
     }
     
     return mpReferences;     
  
}