You can refer to this official document: Cancel a purchase order product receipt with a linked item requirement | Microsoft Learn. This article explains how to cancel a project purchase order that has a connected (linked) item requirement. It is specifically stated that these features don't affect existing item requirements if the packing slip was previously posted for them. Only new item requirements and existing item requirements that no packing slip has been posted for use the new posting behavior. Or you can check out this official document: Project item requirements | Microsoft Learn. It introduces that the functionality provided by the packing slip cancellation feature and limitations of item requirement cancellation.
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Kevin
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