Point of Sale invoices now automatically apply a customer's payment terms when an order includes a pay-later payment method. This helps ensure deferred payments are billed with the correct due dates and conditions, reducing manual follow-up and invoicing errors.

Sets the `invoice_payment_term_id` on POS invoices when the customer has a payment term and at least one payment method is of type `pay_later`. This ensures correct invoice terms are applied for deferred payments.

task-id: 4808683


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Belgian deductible expense rates now default to starting at the beginning of 2025 instead of the module installation date, making historical expense reporting more accurate. Views and reports also show 100% deductibility when no special rate is defined, avoiding blank values and reducing confusion.

We have included deductible expense rates for Belgium - but the starting dates default to the module installation date. In most cases they should apply historically too.

task-4813998