SAP FICO - Base Line Date

what determines the baseline date for due date calculation ?

The cash discount period, and the cash discount percentage.

Terms of payment (Payment Terms)When generating an invoice, such as with a Net 30 term, the baseline date is determined by adding 30 days to the original payment date, resulting in a 45-day payment window if the payment date is set 15 days after the posting date. In the case of 2/10, Net 30, providing a 2% discount if paid within 10 days, the customer has a 25-day window (10 days for the discount plus an additional 15 days) to make the payment to avail the discount, otherwise, the full net amount is due in 30 days. This is how Term of payment determine the baseline date.

SAP Payment Terms refer to the conditions agreed upon between business partners for the payment of invoices.

These conditions define the due date of the invoice and the cash discount offered for payment within a predefined time period.04 Payment terms are maintained in vendor and customer masters to default at invoice level, but can be changed at invoice level.

For FI invoices, payment terms are defaulted from "Accounting View" for customer and vendor. Payment terms can be customized using transaction code OBB8 or IMG menu path.

SAP Sourcing provides default payment terms, but you can also create and edit payment terms. To create purchase order payment terms in SAP, you need to define a payment term code and assign it to a vendor master record.