This article provides detailed explanations of the Approval Reports available in PPO:
Approval Detail Report
The report includes all the fields on the Approvals entity for all approval records. This report is only available in datasheet view.

Outstanding Approvals Report
The report shows all the items that require approval (Approvals where the Approval Status is Ready or Declined). The report can be filtered further to only include approvals related to certain projects or specific approvers.
Pending Approvals Report
The report shows all the items that have not yet been submitted for approval (Approvals where the Approval Status is Pending). The report can be filtered further to only include approvals related to certain projects or specific approvers.