Part of my application for the UMID card said the same thing about the NSO Birth Certificate. I left it blank and the lady at the desk just wrote N/A in the space, whilst telling me about her Aunt who lived in London. Actually, I usually give them a nice smile, tell them in Tagalog that i have forgotten my "eye" glasses and they fill in all the forms for me

Has your wife received her NSO certificate?

When they first brought out the new computerized system a few years back, my wife had major problems with her birth certificate. The fact she had lived abroad for over a decade and was applying for her 6th passport didn't count! Took over a year and 3 court visits to sort out, even though it was obvious to everyone that it was their fault.