MSP430FR5739 UART with GRACE and RX with interrupts

Goodmorning,

I'm trying to send and receive characters from my MSP-EXP430FR5739 board using an UART communication.
So I used Grace Tool to initialize eUSCI_A0 module to work in UART mode enabling receive interrupt.
Then I defined a Interrupt service routine in the InterruptVectors_init.c file as follow:
/*
 *  ======== eUSCI_A0 Interrupt Service Routine ========
 */
#pragma vector=USCI_A0_VECTOR
__interrupt void USCI_A0_ISR_HOOK(void)
{
    /* USER CODE START (section: USCI_A0_ISR_HOOK) */
    /* replace this comment with your code */
        switch (__even_in_range(UCA0IV, USCI_UART_UCTXCPTIFG)) {
            case USCI_NONE: break;
            case USCI_UART_UCRXIFG:
                _val = EUSCI_A_UART_receiveData(EUSCI_A0_BASE);
                //rx = EUSCI_A_UART_receiveData(EUSCI_A0_BASE);

                    break;
            case USCI_UART_UCTXIFG: break;
            case USCI_UART_UCSTTIFG: break;
            case USCI_UART_UCTXCPTIFG: break;
        }

    /* USER CODE END (section: USCI_A0_ISR_HOOK) */
}

But when I placed a breakpoint near the "switch" call and I tried to send something from the other side, CCS didn't stop.
So it seems that I receive nothing. So...first dubt: is my ISR routine correct? The second one is: do I have place it in the correct place?

Could anyone help me, please?

Thanks in advance!
L.