In my previous attempt the 4th step was to do a payment allocation. So I think I have done what you have mentioned already.
I also did a " payment due within 10 days " sale same result. hoping the different approach would make a difference.
1) created " Sales Order Entry " for a customer with payment due within 10 days
2) Then added a " Delivery of Sales Orders "
3) Then " Invoice Against Sales Delivery "
4) Now if I go into "Customer Allocation Inquiry" under " Inquiries and Reports " it shows me a pending entry. There I can use the cash icon to add a payment.
5) After clicking the cash icon I'm at " Customer Payment Entry " page. There I allocate all and process the payment.
But no change " Our Order No " is still showed zero in customer payment printout