There seem to be gaps in your story. e.g. if a material is missing then a requisition needs to be created.
If this delivery time is not sufficient then you either have to reschedule your PM order or need to see that you get the material earlier with a rush order.
And here comes the buyer into the game who tries to find a supplier who can deliver on the wanted date. If such supplier was found then the buyer creates the purchase order with the desired delivery date. The ATP check will then find this PO and know that component will be available right on time.
There is not any approval process of delivery dates. If the buyer can't find a vendor for the desired date then you just can't execute your PM order. For such rush orders the planner is anyway in close contact by phone or email with the buyer. And either one has to get active depending on the situation. Why should the buyer first approve the wanted delivery date if he finally creates the orders anyway?
The "approval" process is more on the planner side whether he can accept the delivery date if it is later than expected.
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