as you did not really explain your selection and if it was an equal value that you saw for a previous month you may need to check this more in detail yourself from the customizing settings in IMG > Logisitics general > Logistics Data Warehouse > Updating > Updating Definition > Specific Definition Using Update Rules > Maintain Update Rules
Enter S012 and SAP and then check in the details of fields based on what they get their update.
It is usually based on PO date. if you had you PO created in Mail, but your receipts in June, then you will find your data under Mai in MCE3