Hi,
I have an IG with a M/F Gender column as a switch.
If another column is selected from an LOV then I populate (among other columns) the Gender.
This column is then set to disabled using a dynamic action on change of the LOV column,
However, even though the switch values are valid, the cells are errored with "Gender must match the values M and F"
Oddly, this works if it only one row being inserted or changed, but triggers the error if there are 2 or more.
If I change the switch to a radiogroup then everything works as expected. (But radio-groups in IGs look a bit messy at the moment I'm afraid)
I have put an example on apex.oracle.com by tweaking the Sample Interactive Grids page 36 to fire a DA to disable the On Leave Switch column.
(Note that changing the settings to be custom Y:Y N:N does not work either so it isn't the display vs return that is causing it)
If you try to change a couple or rows and press save you get the error, 
See here:
https://apex.oracle.com/pls/apex/f?p=88766:LOGIN::::::
GUEST/ Wordpass1!
Page 36
Regards
Mark Cary