SAP tcode to monitor ASN, outbound purchase order EDI

Hi,

When supplier purchase orders send to suppliers through EDI and get ASN in to SAP for inbound deliveries. I want to get started on how to monitor outgoing purchase order EDI and inbound ASN for inbound delivery in SAP. Pls advice what are the relevant SAP transactions I have to use to monitor outbound EDI purchase orders in SAP and inbound ASN (monitor errors and bring in IBD ASN).