docs: @Override
      public boolean deliveryDelayableUnlock(PersistentTransaction tran, long lockID) throws MessageStoreException {
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.entry(this, tc, "deliveryDelayableUnlock", "tran=" + tran + "lockID=" + lockID);
  
          boolean removeFromDeliveryDelayIndex = false;
          try {
              /*
               * Only if the item is not expiring and its in store and if its not being
               * removed(removal can happen when destination is being deleted)
               * we have to unlock.
               * Else it means the item is being expired and there is no point unlocking an expired item
               */
              if (!isExpired() && isInStore() && isStateLocked()) {
                  //Unlock the item and dont increment the unlock count
                  unlock(lockID, tran, false);
              } else {
                  if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled())
                      SibTr.debug(this, tc, "Did not unlock item " + getID() + "whoes item link state is :" + _itemLinkState
                                            + " because: either"
                                            + "its expired or its not in store or the item link state is not "
                                            + "ItemLinkState.STATE_LOCKED");
              }
              // Remove from the unlock index
              removeFromDeliveryDelayIndex = true;
          } catch (MessageStoreException e) {
              //Something wrong has happened.We should not remove from the DeliveryDelayManager so that we can try next time
              removeFromDeliveryDelayIndex = false;
              com.ibm.ws.ffdc.FFDCFilter.processException(e, "com.ibm.ws.sib.msgstore.cache.links.AbstractItemLink.deliveryDelayableUnlock", "1:231:1.145", this);
              if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled())
                  SibTr.debug(this, tc, "failed to unlock item " + getID() + " because: " + e);
  
          }
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.exit(this, tc, "deliveryDelayableUnlock", removeFromDeliveryDelayIndex);
          return removeFromDeliveryDelayIndex;
      }