PA32 PLT WAS ACCUSED OF A RWY INCURSION WHEN HE TAXIED INTO POS AND HOLD AT IXD. ATCT LCL CTLR #1 CLRED THE PLT INTO POS. ATCT LCL CTLR #2 WANTED TO KNOW WHY THE PLT TAXIED ONTO THE RWY.

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I CALLED IXD GND CTL ON 124.3 AND RECEIVED CLRNC TO TAXI TO RWY 17; WHICH I DID. I STOPPED AND HELD SHORT OF THE HOLD SHORT LINE; AND CONDUCTED A RUN-UP AND PREFLT CHKLIST. I THEN SWITCHED TO TWR ON 133.0 AND SAID I WAS READY FOR TKOF ON RWY 17 AND WOULD BE DEPARTING SBOUND. THE TWR CTLR SAID TO 'TAXI TO RWY 17.' THIS WAS AN UNEXPECTED MESSAGE; AS I WAS ALREADY AT THE HOLD SHORT POS FOR RWY 17. I ASKED HIM IF I WAS CLRED FOR TKOF ON RWY 17; AND HE SAID 'I WAS CLRED FOR TKOF RWY 17.' AT THIS POINT; BUT NOT BEFORE; I TAXIED INTO POS ON RWY 17 AND PREPARED TO ADVANCE THE THROTTLE. JUST AS I WAS ABOUT TO START THE TKOF ROLL; A DIFFERENT CTLR XMITTED ON 133.0 AND SAID 'ACFT X; NEW CENTURY GND.' I CALLED BACK; AND THIS CTLR CLAIMED THAT I SHOULD BE HOLDING SHORT OF THE RWY. I INFORMED HIM THAT I WAS ON THE RWY BECAUSE I WAS CLRED FOR TKOF ON RWY 17. HE TOLD ME TO TAXI CLR OF THE RWY; SO I RETURNED TO MY FORMER POS SHORT OF THE HOLD SHORT LINE. I THEN CALLED THE TWR AGAIN ON 133.0 AND SAID I WAS READY FOR TKOF ON RWY 17. THE TWR CLRED ME FOR TKOF; AND SAID TO CALL THE TWR UPON LNDG. I TAXIED BACK ACROSS THE HOLD SHORT LINE AND DEPARTED. AFTER CALLING THE TWR; EXPLANATION GIVEN IS THAT ANOTHER ACFT CALLED TO TAXI AT THE EXACT SAME TIME I CALLED THAT I WAS READY FOR TKOF. THE CALLBACK TO TAXI; HEARD ON TWR FREQ; WAS FOR THE OTHER ACFT. ITEM IN DISPUTE IS WHETHER I CROSSED THE HOLD SHORT LINE BEFORE BEING CLRED FOR TKOF; OR NOT.