Is there a way to search by PO number within Posted Purchase invoices?
I think Purchase>History>Posted Invoices then put your cursor in the order no field and Ctl F enter the PO number you are looking for
In Posted Purchase Invoice there's a column as Order No and Pre-Assigned No.
If you posted from Order then Search in Order No - If posted from Sales invoice then search in Pre-Assigned No.
System will take PO number as a description in posted purchase invoice list .