By using a mapping lookup, mapping programs can call functions from other application systems while a mapping program on the Integration Server is being executed. This may be necessary for the following reasons:
● To read from application system data in the mapping program
● To call existing mapping routines in the application system
A lookup is not mandatory for mapping values to one another in a mapping program. For this purpose, use the global value-mapping table to implement value mappings separately from the remainder of the mapping (see also Executing Value Mappings).
The mapping runtime has a lookup API for calls to application systems. It supports access using the RFC, JDBC, and SOAP adapters. If you want to use a third-party adapter for a mapping lookup in an application system, the adapter must fulfill the following requirements:
● The adapter must support synchronous calls.
● The adapter must not depend on information from a receiver agreement. If the adapter depends on this information, processing of the mapping lookup is terminated.
You can perform mapping lookups in both the central and non-central Adapter Engine.
1. Check whether the application system that you want to call using a lookup contains an adapter that satisfies the prerequisites above.
2. Depending on the type of mapping program you are using, follow the description in the relevant procedure below: