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TMS320F28377S: Standard ISR is executed instead of the own ISR

Part Number: TMS320F28377S

Hello experts,
I have a problem with the execution of an ISR. I have entered in the PieVectTable.SCIA_TX_INT = &sciaTxFIFO_Isr; the address where the ISR should jump to.But as soon as I start the program, the processor jumps to the default ISR interrupt void SCIA_TX_ISR. can someone tell me what the reason is?
I would like to have running my own ISR  instead of the default ISR.

I have the prototype at the beginning of my program and the ISR looks like this. 

interrupt void sciaTxFIFO_Isr(void)
{
testok=5;

SciaRegs.SCIFFTX.bit.TXFFINTCLR=1; // Clear SCI Interrupt flag
PieCtrlRegs.PIEACK.all|=0x100; // Issue PIE ACK
}

Kind regards 

Artur