Products created should be storable products and not service or consumable.

Storable Product - if you want to manage and track stock in inventory.

Consumable is a physical product that is treated like a stockable product, with the exception that stock management is not taken into account by the system.

Service is a non-material product that you provide.

Refer to this on how to create purchase products correctly.

If you have accidently created wrongly, refer to the following 2 videos to rectify the issue:

1. Update product type from service/consumable to storable product. Note you must either update the inventory manually or cancel and re-confirm the PO again in order to rectify the products in inventory.

2. If other PO that are using this product, follow step 1 to rectify the issue.