Sources can not be deleted regardless of product assignment.
Affected products and versions
- Magento Commerce Cloud all versions, with Magento Inventory installed
- Magento Commerce 2.3.0 and later, with Magento Inventory installed
- Magento Open Source 2.3.0 and later, with Magento Inventory installed
By design, it is not possible to completely remove a source and/or change its code.
Removing a source entirely would cause order data issues, because sources are part of product inventories, orders, shipment data, and much more.
The code is vital for connecting the source to orders. This is a unique ID for the source and is disabled from editing.
You can remove a source from a product by transferring the inventory or dropping the product from all shipments at a location.
If you need to remove a source from SSA calculations and Magento Inventory order processing, you can disable the source. Disabled sources retain all data, assigned products, and inventory quantities, and may be re-enabled any time to begin shipping again.
See the Create Sources guide on details how to disable a source.