Bob,

thanks for the tip. I guess it is a remainder from older days, when I
was first trying similar formulas, either with SUMPRODUCT or with
SUM(IF... Having not thought of the -- conversion before joining the
newsgroups, I sometimes had to devise more elaborate conditions. Thus
some insecurity often prompts me to overdo it with conversions lol.

With this opportunity I must say that I have learned a lot of things
from your posts and continue learning. Keep up the good work!

Kostis