Thanks for the feedback. The (NEXT(,...,...)) function seems to be my
answer.
I think my duplicate invoice numbers were happening when a slow network
connection was failing to update the single column in a single row where
my invoice number is stored. Before it could update someone on another
connection was retrieving the same number for their invoice.
I needed a system that did not depend of an UPDATE command to set the
next number.
If I use the NEXT command, no matter who hits the invoice number it will
always assign the next number.
What I don't understand is.... The invoice number column that is set to
autonumber and that is being polled for the NEXT invoice number is not
updated and always shows the starting number! It seems to not matter if
you disconnect, drop rbase, upon restart it will assign the correct next
number even though the field shows the original starting number. It
must be storing the next autonumber in the database... not in memory.
I can use this but it feels strange, not seeing, what the next number
is. I can update another column to store the current next number, but
to update the autonumber column would create the same duplicate invoice
number problems when a station was slow to update.