Required Field with Conditions Using Client Code

Hi,



I was wondering how can we conditionally set a specific field to become required in client code? The condition must consider on whether the value in other field is greater than or equal to 20, then the specific field is required.

I had tried to implement it using business rules, but I found that business rule can only consider whether it is filled / not filled in OR equal / not equal. It does not have the option to check greater than or equal to a specific value.

So my attempt was to try using client code to check whether the value is greater than 20, and set the specific field to become required.

Any help here is much appreciated!

Thanks