Dave,

*repost for better formatting*
>>I see, set the expresion to COMPANY + ACCOUNTCODE + STR(10^16 - DUEAMOUNT) or something close to that. You can do that date the same way.
>
>I see problems with that approach. See what happens with these numbers:

? str(10^16 - 12345678.97)

>? str(10^16 - 12345678.98)

I'd suggest this:<pre>COMPANY + ACCOUNTCODE + STR(0 - dueamount, 15, 2)

Duh. Mine won't work either, since the resulting leading "-" when dueamount starts positive will come *after* a blank space when dueamount starts negative.

So it's back to Craig's suggestion of subtracting dueamount from a larger number, if you have a top limit to valid values. You do, however, need to specify the number of places in the STR command (especially number of decimal places).