B737 PIC ALLOWS 2 DEADHEADING FLT ATTENDANTS; THAT WERE PRESCHEDULED TO RIDE CABIN TO A FLT ASSIGNMENT; TO RIDE IN COCKPIT WHEN DENIED BOARDING BY CSA'S AT BNA; TN.

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DEPARTING NASHVILLE WITH A OVERSOLD FLT. AT THE GATE; THE CSA SUPVR SAID THEY WERE NOT GOING TO GIVE OUR DEADHEADING FLT ATTENDANTS SEATS ON THE ACFT ON THEIR SCHEDULED DEADHEAD FLT; DUE TO AN OVERSELL. I TALKED TO BOTH THE CSA'S AND CREW SCHEDULING (FLT ATTENDANTS) REGARDING THE MATTER; AND WAS INFORMED THEY WERE ON MUST RIDE STATUS. STILL; THE CSA'S SAID THEY WERE NOT GOING TO GIVE THE FLT ATTENDANT'S BOARDING PASSES. AFTER BEING INFORMED THAT THE FLT ATTENDANTS WERE NOT GOING TO BE ABLE TO GET OUT OF NASHVILLE THAT NIGHT; I CALLED CREW SCHEDULING AGAIN TO FIGURE OUT WHAT THE OPTIONS WERE. SCHEDULING SAID THE CSA'S NEEDED TO PULL SOME PAX OFF THE PLANE; BUT THE CSA'S CONTINUED TO ARGUE AND SAID THEY WOULDN'T. WHILE I WAS ON THE PHONE; WITH THE CREW SCHEDULING SUPVR; THE CSA SUPVR CAME OVER AND ASKED IF I WOULD CARRY 2 FLT ATTENDANTS IN THE COCKPIT; SO WE WOULDN'T HAVE TO PULL ANY OF THE PAX OFF THE ACFT (ALL WERE ALREADY SEATED). I MENTIONED THIS TO THE CREW SCHEDULING SUPVR; AND WE ALL AGREED THIS WOULD SOLVE THE PROB; AND OFF WE WENT! I FELT THAT BECAUSE THE FLT ATTENDANTS WERE ON DUTY IN UNIFORM IN THE COCKPIT DURING THEIR OTHER DUTY TIMES; THAT THIS WAS A GREAT SOLUTION OF THIS PROB. I DID NOT KNOW AT THE TIME THAT THIS IS AGAINST FAR'S (NOR SHOULD IT BE!). MY MISTAKE! THE FO HAD NO KNOWLEDGE EITHER. IT WAS TOTALLY MY DECISION AS CAPT. TO PREVENT THIS; I WOULD MAKE SURE IT IS CLR TO PULL BOARDING PAX FOR DEADHEADING CREW MEMBERS BY THE CSA'S BEFORE THE FLT.