VOV6: In the schedule line cat. (standard is CB), you can set the PR order type, PR item cat, and PR account assignment cat.
VOV7: In the corresponding item cat., you need to turn on the "Create PO Automatic." checkbox.
BD86: Configuration & Data consistency checks. This transaction help you to check if you have any setting / data missing for the system to create PO automatically.
You need to set the default PO order type under your Sales Org. in IMG.
Also, you need to have a purchase info record, so the system can set the vendor and purchasing price in the PR and PO automatically.
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