I want to enable the import receipts functionality in SAP Ariba Buying but I am not sure how to configure it.

Contact SAP Support to enable the import receipts functionality for your site.

File channel integration:

No additional configuration is required. Use the Import Receipts task in Data Import/Export to import receipts.

Web service integration (including ISMG):

1. Contact SAP Support to enable the feature Realtime Receipts import[ER-19150].
2. Enable the parameter Application.Receiving.RealTimeReceiptImportEnabled.
3. Configure the Webservice mode for the Import Receipts from an External Application integration event.

Configure the following if you need concurrent receiving (receiving against an order that is initially either manually received or imported):

1. Contact SAP Support to enable the feature Allow receiving on order or contract via User Interface and Receipt Import simultaneously feature [ER-15528].
2. Contact SAP Support to enable the feature Allow receiving on order or contract via User Interface and Receipt Import feature [PR-418].
3. Enable the parameter Application.Receiving.AllowReceivingByUserInterfaceAndReceiptImport.
4. Enable the parameter Application.Receiving.AllowReceivingByUserInterfaceAndReceiptImportEnhanced.

When importing receipts from ERP through SAP Integration Suite, Managed Gateway for Spend Management and SAP Business Network (ISMG), configure Defining Condition Records and Output Types to Export Goods Receipts. Custom integrations, including sending multiple receipts in sequence within a few seconds of each other, are not supported. Ensure an interval gap of at least 30 seconds between individual receipt documents.

Note: This feature is not supported when the purchase order has a combination of material and service lines. In such cases, the system does not create a new composing receipt on the purchase order when you reopen the order after an SES is created and the order is closed.

Receipts imported from ERP to SAP Ariba Buying solutions were stuck in the Processing/Awaiting Processing state

SAP Integration Suite, Managed Gateway for Spend Management and SAP Business Network Configuration Guide > Configuring Supported Transactions > Configuration of Transactions Supported by SAP Ariba Procurement solutions > Export of Goods Receipts > Defining Condition Records and Output Types to Export Goods Receipts

SAP Integration Suite, Managed Gateway for Spend Management and SAP Business Network Overview Guide > Transactions for SAP Ariba Procurement solutions > Outbound Transactions for SAP Ariba Procurement solutions > Goods Receipts

Core Procurement > Core Administration > File Channel Integration
Purchasing > Receiving > Receipt Import/Export
Purchasing > Requisitioning