If a database is set to inherit its design from a template, but the “Shared Actions” element has “Prohibit design refresh or replace to modify” enabled, attempting to edit any single shared action produces the message “If you make changes to this design element, you may lose them, as it inherits its design from a different template” with OK/Cancel buttons.
That prompt should not appear in this situation, because of the “Prohibit design refresh or replace to modify” flag on the “Shared Actions” element.