CCS/MSP432P401R: COMP_E with CCS example using a pin other than P8.0?

Tool/software: Code Composer Studio

Now, that the code example works (msp432-401x_comp_05_MSP_EXP432P401R_nortos_qcc), I am stuck with another problem. If I try to use another pin than P8.0, I can't get the code to work.
Details: 
If I try to use P7.7, which is, accordingly to slas826g.pdf (page 168), C0.2  (instead of P8.0 which is C0.1), as (acceptable) analog input for the voltage which will be compared through COMP_E,

I changed

    COMP_E0->CTL0 = COMP_E_CTL0_IPEN |      // Enable V+, input channel CE1
            COMP_E_CTL0_IPSEL_1;

to

    COMP_E0->CTL0 = COMP_E_CTL0_IPEN |      // Enable V+, input channel CE1
            COMP_E_CTL0_IPSEL_2;

And  I also changed

     COMP_E0->CTL3 = BIT1;
to

      COMP_E0->CTL3 = BIT2;

And while it compiled perfectly, I cannot turn the red led off even when P7.1 is grounded (with other things as described in your previous posts and which works using P8.0)

I even added 
     P7->SELC |= BIT7;

to be sure to put P7.7 into the right selection, just in case, even if note (4) of slas826g (page 168) seems to imply that this is not required, in this case.

Do you have a working example for another pin than P8.0 ?

Thanks for your attention, as usual, it is appreciated.