When the payment/commitments are scheduled, the "hold" feature is not flexible enough to put "hold" on a particular installment and "unhold" the rest. It would hold all the installments for that invoice/commitment. It does not allow to hold just the one particular installment e.g. "December or last installment upon submission of final report" etc.
The feature would be very helpful to strengthen internal control or processing of payment/installment with and without conditions