Manual Supplier invoice matching - Additional Authroization step required

Hi, 

User created PO for QTY 28,764.08 EA and unit price is $1.00. User created two receipts one for QTY 3,500 ea and 25,264.08 ea. 

For 3,500 ea recevied an invoice and match without any additional steps. 

Recevied balance QTY 25,264.08 ea and recevied second supplier invoice for only 5000 ea and matched. System is asking for additonal authorization.