A300 CREW HAD A RWY INCURSION ON RWY 27 AT MTPP AFTER THE CREW WAS CLRED TO BACK TAXI TO RWY 27. A LNDG LIGHT TWIN HAD TO GO AROUND.

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RWY INCURSION. DEPARTING PAP RAMP AREA; TAXI INSTRUCTIONS WERE ISSUED BY TWR. THE XMISSION WAS DIFFICULT TO UNDERSTAND BECAUSE OF THE CTLR'S ENGLISH AND THE RADIO XMISSION QUALITY. AS FO; I READ BACK WHAT I DECIPHERED THE INSTRUCTIONS TO BE 'BACK TRACK AND LINE UP RWY 27.' ABSENT A CORRECTION BY THE CTLR; I CONCLUDED THAT MY UNDERSTANDING OF THE INSTRUCTION WAS CORRECT. THE CAPT THEN REITERATED 'BACK TRACK RWY 27' TO CONFIRM WITH ME OUR INSTRUCTIONS. WE RECEIVED OUR RTE CLRNC WHICH WAS DIFFERENT THAN THE FILED RTE; THEREBY CREATING EXTRA LAST MIN PREDEP WORK. IT IS A VERY SHORT DISTANCE FROM THE RAMP TO THE RWY AND WE WERE CLRED TO PROCEED INTO POS FOR DEP; SO I WAS 'HEADS DOWN' WITH THE RTE CHANGE AND WAS NOT CAREFULLY MONITORING THE CAPT'S TAXI PROGRESS. A R TURN ONTO THE RWY FOR BACK TAXI REQUIRED THE CAPT TO LOOK XCOCKPIT TO CLR FINAL. I BELIEVE MY ATTN WAS DRAWN OUTSIDE BY A 'FINAL'S CLR' CALL OR SOMETHING SIMILAR FROM THE CAPT. PAUSING BRIEFLY TO COMPLETE AN FMC INPUT; I THEN LOOKED R AND NOTED A LIGHT TWIN ENG ACFT ON ABOUT A 1 MI FINAL. THE CAPT SIMULTANEOUSLY IDENTED THE TFC BUT BY THE TIME OUR AIRPLANE WAS STOPPED; THE NOSE OF OUR ACFT WAS EXTENDED ONTO THE RWY. THE ACFT ON FINAL HAD APPARENTLY ENTERED A SHORT FINAL FROM A HIGH VFR BASE LEG AND BEEN OUT OF THE CAPT'S XCOCKPIT VIEW. THE LIGHT TWIN EXECUTED AN UNEVENTFUL GAR AND THE 2 ACFT WERE NEVER CLOSER THAN AT LEAST 1 MI SEPARATION AT ANY TIME. WE WERE THEN INSTRUCTED TO BACK TRACK AND; ONCE POSITIONED; CLRED FOR TKOF. THERE ARE A FEW RISK FACTORS INHERENT TO PAP AND OTHER LOCATIONS FROM WHICH WE OPERATE. ONE IS THE UNAVAILABILITY OF A RTE CLRNC UNTIL TAXI HAS BEEN INITIATED. THIS DELAYS AND COMPRESSES THE PREDEP WORKLOAD INTO THE FINAL MOMENTS BEFORE TKOF WHEN BOTH PLTS' ATTN SHOULD BE FOCUSED ON AVOIDANCE OF SITS LIKE THIS. ABSENT PARALLEL TXWYS; THERE IS THE NEED TO BACK TAXI AND ENTRANCE ONTO THE RWY OFTEN OCCURS WELL BEFORE THE CREW AND ACFT ARE PREPARED FOR DEP. ON MANY OCCASIONS THE CLRNC IS NOT ISSUED UNTIL YOU HAVE ENTERED THE RWY LEAVING FINAL PREPARATIONS AND CHKLISTS TO BE RUSHED OR CAUSING THE ACFT TO SIT ON AN ACTIVE RWY FOR AN EXTENDED PERIOD. THE CORRECTIVE ACTION I INTEND TO TAKE (AND WOULD RECOMMEND TO OTHERS) IS TO RECOGNIZE THESE RISK FACTORS AND REQUIRE ISSUANCE OF A RTE CLRNC AND COMPLETION OF DEP PREPARATIONS PRIOR TO TAXIING. THIS WILL THEN LEAVE BOTH PLTS TO FOCUS THEIR FULL ATTN ON SAFELY MOVING THE ACFT AND TRYING TO ENSURE THEY UNDERSTAND THE CTLR'S INSTRUCTIONS.