My Receipts search criteria issue

Summary

Since a few days the fields marked with two stars (at least one required) have changed

Content

Hi,

In our Production environment the setup related to the My Receipts search have changed.  Previously the two fields 'Purchase Order' and 'Transfer Order' used to be marked with the double star, meaning they were part of the fields with 'At least one is required'. This meant one could add the PO number and search for it. 

Now, the system is Prompting us to give either 'Requester' or 'Entered by', and it does not accept us to give only the PO number.