TXWY INCURSION NEAR THE RAMP DEP AREA WHEN A TAXIING B757 IS CHALLENGED BY THE TWR FOR A TAXI CLRNC DEV AT TNCA; FO.

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MY FO CALLED BEATRIX TWR TO PUT CLRNC ON REQUEST; THEN CALLED TWR FOR TAXI/ENG START. TWR TOLD HIM TO CONTACT APRON. APRON TOLD US TO STAND BY UNTIL OTHER ACR WAS CLR. THEN APRON CLRED US TO PUSH BACK AND START ENGS. AFTER WE WERE STARTED AND DISCONNECTED; WE CALLED APRON FOR TAXI. APRON CLRED US TO TAXI AND TO CONTACT TWR. WE STARTED TAXIING ON THE RAMP AND CALLED TWR. THEY SAID; 'WHY ARE YOU TAXIING WITHOUT CLRNC?' WE SAID 'WE HAD CLRNC FROM APRON.' TWR ALSO STATED 'WE DID NOT HAVE CLRNC TO START ENGS.' WE SAID THAT; 'YOU; THE TWR; HAD CLRED US TO APRON WHEN WE ASKED FOR PUSH/START AND APRON CLRED US.' BOTTOM LINE THE PROCS LOCATED ON PAGE NEED TO BE REVIEWED AS THEY ARE NOT CLR TO ME AND MAY NOT BE CLR TO OTHERS. DOES APRON HAVE AUTH TO CLR US TO PUSH/START? IF NOT; WHY IS TWR CLRING US TO THEM? IT ALSO STATES THAT CLRNC TO PUSH IS ALSO CLRNC TO START ENGS. WE FELT WE FOLLOWED PROCS AS STATED IN THE BOOK AS BEST WE COULD AND OBVIOUSLY THE TWR DID NOT. ANY HELP IN MAKING IT CLRER WOULD BE APPRECIATED. SUPPLEMENTAL INFO FROM ACN 588726: ONCE ENGS WERE STARTED; WE REQUESTED TAXI FROM APRON AND WAS CLRED TO TAXI AND TOLD TO CONTACT TWR BEFORE PROCEEDING ONTO ACTIVE TXWY G WHILE STILL ON THE RAMP. PROCEEDING TO TXWY G; WE CONTACTED TWR AND REQUESTED TAXI INSTRUCTIONS AND CLRNC. WHEN TWR RESPONDED; WE WERE TOLD WE WERE IN ERROR FOR NOT CONTACTING TWR BEFORE STARTING TO TAXI WHILE STILL ON THE RAMP.