If a service calls another service, this should be modeled with the pre-defined "Uses" association.
Service callingService = ...;
Service calledService = ...;
// find the "Uses" concept
ClassificationScheme associationType
= bqManager.findClassificationSchemeByName(Collections.singleton(FindQualifier.EXACT_NAME_MATCH), "AssociationType");
Concept usesConcept
= bqManager.findConceptByPath("/" + associationType.getKey().getId() + "/Uses");
// create association of type "Uses"
Association usesAssociation = lcManager.createAssociation(calledService, usesConcept);
callingService.addAssociation(usesAssociation); // callingService is now the
// source object of the association
ArrayList associationList = new ArrayList();
associationList.add(usesAssociation);
lcManager.saveAssociations(associationList, false); // save association and
// related modified objects
