Usecase to reproduce:
Create a replenishment of warehouses sheme. E.g:
Production WH -> Distribution WH -> Shops
Set all the rules from SHOP to PRODUCTION as replenish on order.

Go to the replenishment report. Usererror due to a loop in the
rules.

It's wrong because he found twice the same rule that pull from
interwarehouse transit. Fix the code to handle intertransit rules

closes odoo/odoo#109640

Signed-off-by: William Henrotin (whe) <whe@odoo.com>