3222339 - Error on Executing Validation Business Rule

The requirement is to have a validation rule so that information from grid portlets such as National ID, Email, Phone Information or Job Relationships, etc. is always present/cannot be deleted.

But the rule does not popup any message upon deleting the concerned values/records.

By downloading rule trace we see it fails: "Error: Collection Filter can only be applied to a collection, not class"

Similar rules work when used Employee Information Base Object and executed in Add New Employee.

SAP SuccessFactors Employee Central

ECT-16673, ECT-195127, grid portlet, business rule, delete all records, delete entries, validate, null, throw error, warning message, cannot be blank, Error: Collection Filter can only be applied to a collection, not class , KBA , LOD-SF-EC-PER , Person Data (All Person Data Types) , LOD-SF-EC-JRL , Job Relationships , LOD-SF-EC-PER-NAT , National ID - Config, Rules, RBP, UI , LOD-SF-EC-PER-EML , Email Info - Config, Rules, RBP, UI , LOD-SF-EC-PER-PHN , Phone Info - Config, Rules, RBP, UI , Product Enhancement