Purchase Order header is Approved but PO action history shows it as reserved.

Hi,

We have a requirement where we have to display each of the dates of approval for each versions of Purchase Order in a report.

While developing the report, we came across a scenario where the report is fetching PO Status as 'Approved' & PO Approved Date as 'blank' & Revision Number as 'blank'.

On investigation: on PO form we are seeing the PO Status as Approved but in PO Action History we are seeing The PO has been 'submitted' and 'reserved'.

In this case, has the Purchase Order been approved ? If yes , then is the reserved date = PO Approval date ? Why do we see PO as Approved in header but the Action history captures as 'Reserved?