How do I setup a CVR rule that should restrict the values under the parent for two segments?

Summary:

We have a requirement that, Account segment values under the **** parent should not use the Fund segment values under YYY parent. I tried below options to fix this requirement but it's not working.

1. I have selected in Condition Filter and Validation Filter "Is a last descendent of" for both parent values but it is allowing the combination not restricting.
2. If I use "Does not Equal" it is working for only child values not for the parent values.

Could you please suggest the possible way to fix this requirement.

Content (required):

Requirement: Natural account values under the parent of **** may not use the Fund segment values under the YYY parent.