Hi Sandra,
The advice detail section (whether for payments or cash invoices) is really for 'detail' type information such as paid invoices or GL distributions. You shouldn't be putting information common to the entire check in this section because for multi-detail checks, this information repeats (as you have found).
If you don't want GL distribution information to print on the vendor's copy of the advice, you can simply remove the fields from the check specification. Because Adagio Payables allows 2 different advices, you can have an advice for internal use and a separate advice that the vendor receives.
As for the 'repeated' information, it is better to put those fields in either the Advice Header or Footer section; that way it only prints once.