You ar fully right about your advice. :)) The configuration trap I fall in was that I created them Manually: they have to be filled in, otherwise you cannot save them. So that was the reason for naming them CONSTRUCTOR as replecement for I want you to be empty. I tried via export/import but always the complain about sourc & destination are not allow to be empty. So I like the thinking behind the solution but the implementation I failed to do so. 

Hi,

In Odoo, routes and rules are designed to automate and control the flow of products between locations, but they only take effect if the operation type’s locations are not explicitly set. When you define a source and destination in an operation type, Odoo prioritizes these settings because they are considered explicit instructions for where the products should move. The purpose of the settings in the route and its rules is to provide default or conditional paths for products when the operation type does not have fixed locations. They allow dynamic determination of source and destination based on conditions such as product type, stock levels, or specific route criteria. Essentially, rules exist to guide automated routing and logistics, but if the operation type has hard-coded locations, those “dummy” or default settings will always take precedence, making the rule settings effectively ignored in that scenario.

If you want the route rules to control the locations, you need to leave the source and destination in the operation type empty so that the system can compute them dynamically based on the route rules.

Hope it helps.