This fix ensures payments from Point of Sale sessions with split transactions keep the selected customer on the related accounting entries. This helps businesses maintain accurate customer-linked payment records and improves accounting traceability after closing a POS session.

Have a payment method [PAYMENT] on POS with split transactions enabled.
Make a POS sale to a specific customer, pay with [PAYMENT].
Close and validate the session.

While the accounting entry for the POS sale will have the partner set,
this is not the case for the entries related to the payment.

opw-2307973

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This fixes automated accounting-related walkthrough tests that were disrupting localization builds. The change keeps test coverage in the right modules so releases and localization validation can run more reliably without affecting day-to-day users.

The stock forecast report now keeps product variant quantities separate when opened from a product template. This avoids misleading totals caused by combining different variants, making inventory forecasts clearer for users.

The stock forecasted report action aggregate all the products of the
domain in the graph view. Opening the action from a product template
display the quantities for the different variants. Having them summed
doesn't make much sens. This commit ensure the product are not
aggregated.

Task : 2058495