[ic] log_transaction question

[DB]

I wish to set the value of the "payment_due" field of my transactions
table to "1" whenever an order is placed as a purchase order.

I see this section in my log_transaction file

[if value mv_payment_mode eq purchase_order]
set credit_limit: [seti credit_limit][data
                table=userdb
                col=credit_limit
                key="[data session username]"
                value="-[scratch total_cost]"
                increment=1
        ][/seti]
[/if]


Can I add something like an [import]....[/import] statement to this
section to accomplish my goal?

Thanks as always for any clues

DB