如何根据另一个组合框中的选择禁用组合框？

I have this block of code that is giving me results for a combo box, I would like it to ignore the combo box and disable it when the value "SDO/OD" is selected in the one above under the combo box for ROLE aka fcbRole. The following enables the box from the first part, but the second part does not fire off. And it gives me a warning: "This field is required"...Have you seen something like this before?I have this block of code that is giving me res