FLT CREW INADVERTENTLY ENTERS 12000 FEET IN THE FCP ALTITUDE WINDOW DURING THE INNDY 2 TO BOS AND FAILS TO CATCH IT PRIOR TO PVD.

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DSNDING ON INNDY TWO RNAV ARR TO BOS. I WAS PF; AND LEFT THE FREQ AND AIRPLANE CTL FOR THE CAPT WHILE I MADE THE ARR; WX; GATE ANNOUNCEMENT TO THE PAX. I RETURNED TO FREQ AND RESUMED FLYING DUTIES. WE WERE APCHING PVD AND NEARING OUR LEVELOFF TO MEET XING RESTR AT PVD. ATC TOLD US TO SLOW TO 250 KTS ABOUT 15 MI EARLY. WHILE SLOWING; WE LEVELED AT 12000 FT AND APCHED PVD. I NOTICED OUR AIRPLANE DSCNT PATH INDICATION WAS SHOWING US HIGH ON DSCNT PROFILE; AND I WONDERED WHY FOR A FEW SECONDS WHILE WE CROSSED PVD. THEN REALIZED THAT OUR FMS SHOWED 11000 FT AT PVD; AND WE QUICKLY QUERIED ATC ON THE ASSIGNED RESTR. HE SAID; 'YEAH; IT SHOULD BE 11000 FT; BUT THAT'S OK; CONTACT BOSTON APCH ON...' WE HAD INADVERTENTLY DIALED IN THE FCP 12000 FT IN THE ALT WINDOW. I QUICKLY INITIATED DSCNT TO 11000 FT. THERE WAS NO TFC CONFLICT; AND NO FURTHER QUERY FROM ATC. I BECAME DISTR DURING MY PAX ANNOUNCEMENT AND DIDN'T ADEQUATELY XCHK THE FMS; THE FCP ALT WINDOW; AND THE ARR CHART TO ENSURE COMPLIANCE. I BECAME USED TO BEING GIVEN DIFFERENT ALT ASSIGNMENTS THAN PUBLISHED ON ARR DSCNTS INTO MY BASE ARPT WHICH MAY HAVE CAUSED ME TO INADVERTENTLY IGNORE PUBLISHED EXPECTED DSCNT RESTRS. FINALLY; THIS WAS THE LAST DAY OF A DIFFICULT 4 DAY FOR US THAT BEGAN WITH DELAYS; REDUCED REST; AND EARLY MORNING SHOWS. THE PREVIOUS WK I HAD WORKDAYS THAT WENT LATE IN THE DAY AND INTO THE EARLY MORNING; AND MY BODY WAS FEELING FATIGUED AND MALADJUSTED. my REACTION TO SEEING THE ERROR WAS SLOWER THAN NORMAL DUE TO TIREDNESS.