How can we restrict entry of duplicate values in a form without the help of groovy script

Summary:

In one of our PBCS form, we enter salary grades and Job codes. At one instance, a single Job Code has been entered for two salary grades by an end user which is incorrect and this resulted in an error when running business rules. To avoid this scenario, is there a way to put a validation to enter only unique values in PBCS form. Note: We are not using groovy script.

Thank you.

Content (required):

Version (include the version you are using, if applicable):

22.12.68

Code Snippet (add any code snippets that support your topic, if applicable):