Commercial Fixed Wing
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Other / Unknown; Training / Qualification; Communication Breakdown
Deviation - Altitude Undershoot; Deviation - Altitude Crossing Restriction Not Met; Deviation - Altitude Excursion From Assigned Altitude; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance
Air Traffic Control Provided Assistance; Air Traffic Control Issued New Clearance; Flight Crew Became Reoriented; Flight Crew Requested ATC Assistance / Clarification
Human Factors
On the ZZZZZ X arrival into ZZZ; we were given a descent to FL230.  As PF; I re-cruised for FL230.  Prior to ZZZZZ1 we were told to descend via the arrival.  I dialed in 6;000 feet for the Runway XXL approach.  Initially the descent point was visible and looked normal.  After flying several more minutes it became clear that we were past the descent point.  It was about this time that the descent point disappeared from the ND.  We started an immediate Open Descent with full speed brakes.  We were unable to get relief from the altitude/airspeed requirement at ZZZZZ2 (250/110) due to radio congestion.  We were given a frequency change and got relief from ZZZ Approach who gave us a descent to 6;000 feet which we accomplished.  The rest of the approach and landing was uneventful.  When the PF re-cruised he inadvertently typed in '320' instead of '230'.  There was not an immediate erroneous depiction on the ND.  Everything looked normal; however we continued past the descent point.  Just as we realized there was something wrong; the ND descent point disappeared.  The PF has been on reserve and has flown very little in the last two months.  The next two flights went well with no problems.The two pilots were on the first leg of the trip.  It was the first time they'd flow together.  They were working well together and both were attempting to follow policies/procedures.  This was a dumb mistake by one pilot that was not caught by the other.  By re-cruising; the goal was to have the ND provide usable descent point information.  I listed this as a 'Moderate' risk rating because we easily received relief from ATC.  If they had not assisted us; the risk would have been higher.
Air Carrier Captain reported an altitude deviation and explained the PF had been on reserve and flown little in the last two months which may have contributed to the event.