PO update for SES and ME2N

I have following situation:

PO created for $5000 for service- SES created for 1070, MIRO created and paid for 1070 ( $ 70 is or tax)

PO history tab shows SES for $1070: GR for $1070 and IR for $1070

However, when I go into ME2N it shows

Still to be delivered $3930 ( 5000- 1070)

But it also shows- Still to be invoiced - $70

This has already been invoiced and paid for - where is the problem - Why ME2N report is different then PO history tab indication.

Thank you for help in advance

Raj