In two-step processing you use both an inbound mapping and a process-to-backend mapping.

Mapping component	Requirements
Source Connection	B2B EDI Gateway Endpoint
Source Object	get
Target Connection	B2B EDI Gateway
Target Object	CUSTOM_TARGET

Mapping component	Requirements
Source Connection	You can add multiple source connections to the mapping. You can use the following connections in the mapping: B2B EDI Gateway. You must parameterize the connection. Optional connections to other connectors. You can use any Informatica connection that isn't a B2B Gateway connection. Do not parameterize the connections. Connecting additional sources to a B2B Gateway connection or parameterizing them might result in errors at run time.
Source Object	CUSTOM_SOURCE
Target Connection	Any
Target Object	Any

In single-step processing you use an inbound mapping. The following table describes the sources and targets of the inbound mapping in single-step processing:

Mapping component	Requirements
Source Connection	B2B EDI Gateway Endpoint
Source Object	get
Target Connection	Any
Target Object	Any