Automatically generate sequence codes.
If you need to validate a document before assigning a series and code, you can set the code to one of:
0, -, or NA, and the provider will replace it with
the new sequence code.
Selecting the -Dynamic- option will cause entries to be generated automatically
from the invoice's "series" and "tax id" fields. If the sequence has not been created
already, it will be created automatically using the fields defined below.