Invoice Summary Says "Initiated" while the database column "Approval Status is showing as 'Approved;

While doing some research on on the invoice, I noticed that the Invoice Summary states the Approval status as "Initiated" while the database column "Approval Status" from the AP_INVOICES_ALL table as 'Approved'. I noticed that the information in AP_INVOICE_LINES_ALL table with column name ' WFAPPROVAL_STATUS' as "Not required" for the same invoice.

• Did I pick up the wrong table or column ? if so what is the correct table
• How to interpret these details ?

Any help would be appreciated.