private boolean isItemProcessing = false;
    public void scanConsolidationShelf(String shelfLabel, boolean isStrictAdvisingMode) {
        if (isItemProcessing) {
            return;
        }
        try {
            if (consolidationShelfName.isPresent() && !consolidationShelfName.equals(fromNullable(shelfLabel))) {
                if (isStrictAdvisingMode) {
                    throw new LMException(CONSOLIDATION_WRONG_SHELF, shelfLabel, consolidationShelfName.get());
                }
            }
            this.consolidationShelfName = fromNullable(shelfLabel);
            isItemProcessing = true;
            consolidationFacade.putItemInConsolidationShelf(shelfLabel, itemLabel.get());
        } catch (EJBTransactionRolledbackException e) {
            throw new LMException(e, CONSOLIDATION_WRONG_SHELF, shelfLabel, getAssignedConsolidationShelf());
        } finally {
            isItemProcessing = false;
        }
    }