A B757-200 AFTER PUSHBACK HAD THE WINDOW HEAT DEFERRED AND THE FO QUESTIONS IF A NEW MAINT RELEASE SHOULD HAVE BEEN ISSUED.

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AFTER PUSHBACK FROM GATE AT BOS; A WINDOW HEAT INOP LIGHT ILLUMINATED; LIGHT/WINDOW HEAT WOULD NOT RESET. AS PER STANDARD PROC; WE CONTACTED ACR MAINT IN ZZZ VIA COMMERCIAL RADIO. MAINT WAS ADVISED OF THE SIT. MAINT ASKED IF THE FLT WAS PLANNED INTO 'KNOWN ICING' ON THIS DAY. THE ANSWER WAS 'NO.' THE ITEMS WERE THEN DEFERRED PER STANDARD PROC AND PUT IN THE ACFT LOGBOOK ALONG WITH THE MEL NUMBER. MAINT ADVISED US THAT HE WOULD ADVISE DISPATCH OF THE SIT. I THEN ASKED THE CAPT IF WE THEN NEEDED TO CONTACT DISPATCH FOR A RE-RELEASE. HIS ANSWER WAS NO. HIS REASON BEING THAT SINCE WE WERE NOW RESTRICTED FROM 'KNOWN ICING' AND SINCE OUR FLT PLAN WAS NOT ORIGINALLY PLANNED INTO KNOWN ICING NO RE-RELEASE WAS REQUIRED. I INDICATED THAT I STILL THOUGHT A RE-RELEASE WAS REQUIRED -- HE ASSURED ME ONE WAS NOT REQUIRED. FURTHER STUDY INTO OUR ACR FLT OPS MANUAL/OPS SPECS AGAIN LED ME TO BELIEVE A RE-RELEASE WAS REQUIRED. I LATER CALLED OUR FLT OPS DUTY MGR FOR HIS UNDERSTANDING OF THE SIT. HIS UNDERSTANDING WAS THE SAME AS THE CAPT'S; IN THAT NO RE-RELEASE REQUIRED. THE MORE I READ OUR FLT OPS MANUAL; THE MORE I BELIEVE A RE-RELEASE WAS REQUIRED. DUE TO THE DIFFERENT INTERPRETATIONS THAT HAVE OCCURRED; I BELIEVE OUR FLT OPS MANUAL IS NOT CLEAR ON THIS SIT.