do we need to write a behaviour script for that or validator will work?

Saudamini Deshmukh_ep25kd

There are two custom fields named "KA ID" & "Potential Knowledge article" having dropdown of(Yes/No).

for escalation issue type in workflow while closing the issue the KA ID field should be mandatory only when the Potential Knowledge article is set to yes and should not be mandatory when it sets to No.

Nic Brough -Adaptavist-

Either will be able to do it.

Have a look in the https://library.adaptavist.com for examples of both approaches.