AN ACR PILOT WITH A NEW FO ENTERED AN INCORRECT NEW FIX CROSSING ALT NEAR ZZZ AFTER A CUSTOMARY FIX CROSSING ALT WAS CHANGED. NEITHER PILOT CAUGHT THE ERROR.

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FILED AND CLRED FOR THE ABC ARR TO ZZZ. THE PUBLISHED XING RESTR IS XXXXX AT 14000 FT. HAVING FLOWN THIS ARR MANY TIMES; THIS ALT WAS LOADED INTO THE FMS. NOTAMS HAD CHANGED THE POINT AND ALT TO YYYYY AT 12000 FT. OUT OF HABIT I LOADED THE PUBLISHED FIX AND ALT AND NOT THE NOTAMED ONE. THE FO ONLY HAD APPROX 100 HRS IN TYPE AND DID NOT CATCH MY MISTAKE. APCH CLRED US TO YYYYY AT 12000 FT. I PUT 12000 FT IN THE ALT CTL WINDOW AND STARTED A VNAV DSCNT. AT THAT SAME TIME; ONE OF THE FLT ATTENDANTS CALLED AND ASKED IF I COULD CHK ON A GATE THAT HER AIR MARSHAL HUSBAND WAS GOING TO BE COMING INTO. I CALLED THE COMPANY ON THE RADIO AND GOT THE INFO. A FEW MINS LATER; THE CTLR ASKED IF WE WERE GOING TO MAKE THE XING RESTR. THAT IS WHEN I DISCOVERED I DIDN'T PUT IN THE CORRECTION TO THE FMS AND THE VNAV WAS FLYING THE OLD POINT AND ALT. I IMMEDIATELY EXTENDED THE SPD BRAKES AND GAVE THE CTLR THE BEST POSSIBLE DSCNT. NEEDLESS TO SAY; I DID NOT MAKE THE XING RESTR. I SHOULD HAVE BEEN MORE AWARE SINCE I WAS FLYING WITH A LOW TIME FO; AND SHOULD NOT HAVE TAKEN THE TIME TO HELP OUT THE FLT ATTENDANT SINCE I WAS THE PF. NO CONFLICTS WERE CREATED AS FAR AS I KNOW.