- Enable developer mode: Settings > Enable developer mode
- Go to Inventory > Configurations settings > Enable Multi-Step Routes and Save
3. Now we will unarchive the MTO Route, to do so: Inventory > Configuration > Routes > Filter by Archived.
4. Select Replenish on Order (MTO) > Action and Unarchived
5. In order to have only one purchase order per sales order, you will have to configure the propagation in the rules , to do that:
Inventory > Configuration > Rules > Purchase > Edit > Propagation of Procurement Group > Propagate
Do the same for the Replenish on order route (WH: Stock → Customers (MTO)
6. Now you will need to configure your products with the route Purchase + Replenish on Order (MTO)
7. And in the Purchase tab of the product, you will need to add at least one supplier
Ref: You can find original solution from here.