Yes, W-4 was filed correctly and no need for Form 673 as client intended to have the taxes withheld to cover his estimated tax liability.  Clearly, want to avoid the inconvenience of filing  a paper return, given the a foreign address.

I'll contact Intuit technical support to see if I can get a definite answer to whether the e-file will go through with this diagnostic checked off or if there is a workaround to clear the diagnostic.

Appreciate any further insight.