You might have noticed that Dynamics AX does not generate any voucher when you post the product receipt for a purchase order that includes goods that are setup only as procurement categories. The following screenshot shows this standard behavior for the purchase of “staplers”.
The fact that Dynamics AX does not generate any voucher is a disadvantage from a finance & controlling perspective especially in situations where the receipt is recorded in one month and the invoice in the following month. The disadvantage is that the expense reported in the profit & loss statement is incorrect (too low) and that the balance sheet does not include an accrual for those expenses.
Fortunately, you can change this standard behavior by doing some minor changes in the setup of Dynamics AX. The setup I am talking about can be realized by using a purchasing policy and activating the parameter “accrue purchase expense on receipt”. See the following screenshots. 
After activating the aforementioned parameter, Dynamics AX generates a voucher once you post the product receipt for your procurement categories. 
Please note that Dynamics AX uses the “purchase expenditure, un-invoiced” account for the debit posting and the “purchase, accrual” account for the credit posting.
As usual, Dynamics AX reverses the transactions that have been generated during packing slip posting when the invoice is posted.
Dynamics 365FO/AX Finance & Controlling 
Thank you Ludwig, your instructions are very clear and summarize all the steps nicely. I believe I have done all of these steps that you have listed, but I am still unable to get a Voucher to post upon receipt.
However, I then noticed that another test policy that I had created (and expired) still had my company name assigned to it on the Policy Organization Tab. Even though that policy was expired, I needed to remove that company name from the expired policy, before I was able to select it for my newly-created purchasing policy. After that I finally had SUCCESS and my procurement category purchase posted to the GL at the time of receipt.
Thank you for your help. I would recommend adding this to your already your well-defined steps of how to set up the Procurement Purchasing Policy:
If you have multiple companies set up in AX, it is critical to assign the Purchasing Policy to the correct company in the Policy Organization Tab of the Purchasing Policy that you set up in Procurement & Sourcing>Setup>Policies>Purchasing Policies.
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useful information, thanks
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