Sales orders of customer

Hi to all!

I want to display all the sales orders of a customer from (AX 2012 R2):

Accounts receivable > Common > Customers > All customers > (select one customer) > tab Sell > Orders > Sales orders

but the list is empty! I've tried on others AX 2012 R2 systems, but with the same result!

Any ideas?

Thanks

Martina