SAP Material Management (MM) and SAP Supplier Self Service (SUS) and some customizable features of SAP SUS.
In the Plan-Driven Procurement with Supplier Integration scenario the SAP SUS is installed and configured with SAP MM/SRM. Technically, in a classic scenario SAP SUS maybe connected with one or more MM and/or SRM back-end systems.
PO is sent to SAP SUS system, in which supplier can perform the follow-on procurement process, i.e. PO response, ASN, GR response and invoice response.
SAP Supplier Self-Services provides the following processes and functions:
Two scenarios for SAP SUS: SRM-XI-SUS and MM-XI-SUS.
In SRM-XI-SUS the PO is created in an SRM system locally and sent to SAP MM Training SUS. All communication will take place between these two systems via XML messages on both sides with a PI/XI system in between as a mandatory system.
In the MM-XI-SUS scenario the PO will be created in ECC and transferred to SAP SUS. Depending on ECC release there are two different possibilities for this, either the ECC system sends IDOCs or sends XML messages directly. IDOCs will be mapped to XML by PI/XI in all cases, as the SAP SUS system only receives and sends XML messages.
Below is the detailed description on SAP MM ECC sending PO as an IDOC to SUS.