A computer software will be purchased for use in the accounting department of a business. The purchasing process was as follows: 04/10/2021: The accounting department sends an order request form to the purchasing department.

06/10/2021: The purchasing department conducts a price search for the requested software.

11/10/2021: Purchasing department places the order to the company that gives the most suitable price.

15/10/2021: Computer software is received together with the invoice.

22/10/2021: Purchased software is paid for.

In this case, on what date will the accounting entry of the computer software purchase be made? Discuss your reasons.