PO Invoiced status completely while the value doesnt match

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Hi team,

We are facing a situation where user created a PO that was full approved and started receiving invoices. The invoices were to be offset from that PO. The first two invoices went in correctly now we have received the third invoice but unfortunately the PO invoiced status appears to be completed which makes it invisible for selection on the left. I will appreciate your assistance if someone can assist:

- To understand why this has happened

- Advise on way forward as the value of two invoices received do not match PO value and we are keen to invoice using same PO

Regards,

Emmanuel