Just a side note on your answer it worked and it did not work. I assigned the net 30 as default terms to all my customers prier to asking the question but the program did not apply it thus the reason for the question, but after reading you answer I added the terms field to my invoices and low and behold it started to automatically apply the terms to the invoices. I am not sure if this is a issue with the program or not but it may be worth looking into for all you IT guys and Gals out there in radio land.
