With the following transactions you can run a report on Purchase Orders in SAP.
ME2L – Purchasing Documents per Vendor
ME2M – Purchasing Documents for Material
ME2K – Purchasing Documents by Account Assignment Category
ME2J – Purchasing Documents per Project
ME2C – Purchasing Documents for Material Group
ME2B – Purchasing Documents by Requirement Tracking Number
ME2N – Purchasing Documents per Document Number
ME2W – Purchasing Document per Supplying Plant
You'll be asked to select a Scope of List. The values in this filed can be defined via SPRO.
Menu: SPRO> Materials management-> purchasing> reporting>maintain purchasing list->scope of list->define default values for transaction
