Changing the customer number and/or system number on an invoice.

Note:  While you're doing this, nobody can invoice anything.  It holds the saletran file open.

1. Use saletran order tag s_invoice
2. find "xxxxxxx"
3. edit
4. change the customer number (c_number) and/or system number (srv_num).
5. close all
6. do cactus

DON'T DO THIS LIGHTLY!  YOU'RE EDITING THE ACTUAL FILE!