code: private void deleteLinkValue(String targetObjID) {
          int targetShardNo = getTargetObjectShardNumber(targetObjID);
          if (targetShardNo > 0 && m_linkDef.isSharded()) {
              m_dbTran.deleteShardedLinkValue(targetObjID, m_linkDef, m_dbObj.getObjectID(), targetShardNo);
          } else {
              m_dbTran.deleteLinkValue(m_dbObj.getObjectID(), m_linkDef, targetObjID);
          }
          deleteLinkInverseValue(targetObjID);
      }
docs: Delete the reference via our link to the given target object ID and its inverse.