It looks that I found way to create new enumeration type stored in database:

public class OperationParticipant extends AbstractService implements
        IOperationParticipant {
    
    private IProjectArea fProjectArea;
    
    private class enumDetails {
        public String id;
        public String name;
        
        public enumDetails(String identifier, String displayName) {
            id = identifier;
            name = displayName;
        }
    }
    
    @SuppressWarnings("restriction")
    @Override
    public void run(AdvisableOperation operation, IProcessConfigurationElement participantConfig,
            IParticipantInfoCollector collector, IProgressMonitor monitor)
            throws TeamRepositoryException {
        // TODO Auto-generated method stub
        
        List<enumDetails> enumsToCreate = new ArrayList<OperationParticipant.enumDetails>();
        enumsToCreate.add(new enumDetails("hwVersion", "Found In HW"));
        enumsToCreate.add(new enumDetails("mechanicVersion", "Mechanic Version"));
        
        IRepositoryItemService itemService = (IRepositoryItemService)getService(IRepositoryItemService.class);
        this.fProjectArea = ((IProjectArea)itemService.fetchItem(operation.getProcessArea(), IRepositoryItemService.COMPLETE));
        IEnumerationService enumServ = (IEnumerationService) getService(IEnumerationService.class);
        
        for (enumDetails enumDetails : enumsToCreate) {
            Enumeration enumToCreate = EnumerationFactory.eINSTANCE.createEnumeration();
            enumToCreate.initNew();
            enumToCreate.setContextId(fProjectArea.getContextId());
            enumToCreate.setName(enumDetails.name);
            enumToCreate.setIdentifier(enumDetails.id);
            enumToCreate.setProjectArea(fProjectArea);
            enumToCreate.setItemId(UUID.generate());
            enumServ.save(enumToCreate);
        }
        
    }