How to get a custom attribute enumerated value using OSLC Java API in DNG

I have a custom attribute enumerated value. This attribute contains two labels called True and False with two values 1 and 0, respectively.
I think, the problem is that the client's response and subsequent treatment to take the entity as a requirement class does not return the correct structure of this requirement. But i´m mot sure.

My code is:

private static boolean getAttributeLinks(String url, JazzRootServicesHelper helper, JazzFormAuthClient client, String projectArea) {    
        boolean isValid = false;
        
        try {
    
                / Get the URL of the OSLC QualityManagement catalog /
                String catalogUrl = helper.getCatalogUrl();
                
                / Find the OSLC Service Provider for the project area we want to work with /
                String serviceProviderUrl = client.lookupServiceProviderUrl(catalogUrl, projectArea);
                
                //STEP 6: Get the Query Capabilities URL so that we can run some OSLC queries
                String queryCapability = client.lookupQueryCapability(serviceProviderUrl,
                                                                      OSLCConstants.OSLC_RM_V2,
                                                                      OSLCConstants.RM_REQUIREMENT_TYPE);
                
                //Get Feature Requirement Type URL
                ResourceShape featureInstanceShape = RmUtil.lookupRequirementsInstanceShapes(
                        serviceProviderUrl, OSLCConstants.OSLC_RM_V2,
                        OSLCConstants.RM_REQUIREMENT_TYPE, client, "Requirement");
                
                // We need to use Resource shapes to properly handle date attributes,
                // so they aren't interpreted as dateTime.
                // The following 4 lines will enable the logic to properly handle date attributes
                List<ResourceShape> shapes = new ArrayList<ResourceShape>();
                shapes.add(featureInstanceShape);
                OSLC4JUtils.setShapes(shapes);
                OSLC4JUtils.setInferTypeFromShape("true");
        
                ClientResponse getResponse = client.getResource(url,OslcMediaType.APPLICATION_RDF_XML);
                Requirement requirement = getResponse.getEntity(Requirement.class);                    
                // Display attributes based on the Resource shape
                Map<QName, Object> requestExtProperties = requirement.getExtendedProperties();                

                for ( QName qname : requestExtProperties.keySet() ){
                    Property attr = featureInstanceShape.getProperty(new URI (qname.getNamespaceURI() + qname.getLocalPart()));
                    String name = null;
                    if ( attr != null){
                        name = attr.getTitle();
                 
                        if ( name != null) {                            
                            if(name.equals("CUSTOM_ATTR")) {    
                                
                                if(requirement.getExtendedProperties().get(qname).toString().equals("True"))                         
                                        return true;
                            }                               
                        }
                    }
                }

        } catch (Exception e) {
            logger.log(Level.SEVERE,e.getMessage(),e);
        }
               
        return isValid;
   
    }
   
This code works fine if CUSTOM_ATTR is boolen type, but it do not work whether it´s enumerated value attribute.

Any suggestions on how to get the value from this enumerated attribute?

Thanks in advance.