private void checkProposalMinReached(Proposal proposal) {

    int tot = 0;
    for (PurchaseRequest pr : proposal.getPurchaseRequests()) {
      tot += pr.getQuantity();
    }

    if (tot >= proposal.getProduct().getMinToBuyOrder()) proposal.setMinReached(true);
    else proposal.setMinReached(false);

    proposal.merge();
  }