How to populate field with similar names using Appian Selenium API?

I have a form with two fields having similar names:

Field 1 is "Initiating Location with code". This field is non editable field.

Field 2 is "Initiating Location". It's a drop-down field.

With

fixture.populateFieldWith("Initiating Location","Africa")

Appian Selenium API is not doing anything, It looks like it's trying to set value "Africa" in Field 1 but since, it's non-editable, nothing is happening.

I also tried with field index it doesn't work either.

fixture.populateFieldWith("Initiating Location[51[","Africa") AND fixture.populateFieldWith("[51]","Africa") is not working.

Please suggest an alternate approach.