3607954 - Error message for mandatory field is not triggered when using Workflow Rule

A Workflow Rule was created to clear out a field in, for example, Opportunities. However, after the rule is executed, it is expected that the standard error message "Cannot save, as field 'ABC' is specified as mandatory by the administrator" would be display immediately, but it is not.

(ABC represents the name of the standard or custom field used by the Workflow Rule).

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