How to aggregate PO History

Question

Dear All,
I need to aggregate PO ... i try TCode ME87
i enter the plant and PO# then execute then Save aggregation but it show this msg "0 document(s) found for aggregation"

Answer 1

i do what you say i enter a specific Po and execute it show me alist like that:
Document   Item         PO History Records        Delivery Cost Records
6300000119 06660                 2
6300000119 06670                 2
6300000119 06680                 2
6300000119 06690                 2
6300000119 06700                 2
6300000119 06710                 2
6300000119 06720                 2
6300000119 06730                 2
6300000119 06740                 2
6300000119 06750                 2
6300000119 06760                 2
6300000119 06770                 2
6300000119 06780                 2
then i clck on save aggregation and nothing happen is there is something wrong
i read this note in SAP i dont understand it "In case of goods-receipt-based invoice verification, aggregation is
only executed if the quantities (GR<>IR) are cleared per reference document"