Microsoft has recently removed the Purchase Invoice creation feature- when an intercompany partner posts an invoice for a Sales Order. This was done on 12/10/2021. The reason why Microsoft removed this feature, because they have identified a duplicate Purchase Invoice bug in their original solution and this has been reported by many customers globally. If you've been using this feature or if you have done some customizations around it, you might have already noticed this.
You can find more information here,
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