Hello Dmytro,

  The behavior you're experiencing is likely due to how Odoo's replenishment rules and routes are configured. By default, Odoo tries to fulfill the entire demand from one source if possible.

  To achieve your desired outcome (transfer 20 from Store B and buy the remaining 30), you'll need to configure your routes and rules accordingly. Here’s a breakdown:

  First, ensure you have two separate routes:
    One route to trigger a transfer from Store B to Store A.
    Another route to trigger a purchase order for Store A.

  Next, configure the replenishment rule for Store A:
    Set the "Supply Method" to "Take from Stock" for the route from Store B.
    Create a second replenishment rule for Store A with "Buy" as the supply method, ensuring it triggers only when the stock in Store A (after the transfer from Store B) is insufficient.

  You might need to adjust the sequence of these rules to ensure the transfer happens before the purchase order is triggered.

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Assuming replenishment is set to manual, the 'To order' field can be modified to required to value.

In your example - set route to 'buy' and To order to 30 prior to triggering order

Post PO creation the To Order would set to 20 (remaining qty), change the route (Store B to Store A) and trigger order again.

If replenishment trigger is set to auto, only a single route with all of the qty can be triggered.

If the process is to always take from alternate store prior to ordering, you could consider modifying  the delivery route to accordingly.

eg configure rules as

Pull from Store A to customer (supply method take from stock if unavailable trigger another route)

Pull from Store B to Store A (supply method take from stock)

With the above route, 20 qty would be taken from Store B and balance 50 would be replenished with a buy