Dear K .Wassana,
The report is run from parked items and it was parked with wrong amount ka. However, the invoice image can be seen in our system by buyer too.
For standard process, the invoice will be parked to buyer if the GR is not done or has any discrepancy eg. price diff. I find the invoice was scanned on 30.12.14 but the GR is done on 12.01.15. Thus, the invoice needs to park since it was GR missing at that time.
Do your company has Syncro tool? If so, you can check whether the GR done or not for certain PO, and the invoices can be issued to NSN after the GR done. The invoice come with GR done and correct information will be able to processed without any delay.