This section describes how to develop a multi-mapping for a message split (1:n transformation). You can specify the multi-mapping program by means of an operation mapping in logical routing. In this case, the operation mapping not only determines the mapping program, but also determines which target operation the target message is to be sent to in logical routing. Hence the term mapping-based message split.
Multi-mappings require the interfaces involved to be asynchronous. There are no other restrictions on the outbound operation of the operation mapping.
Messages that result from the split in a mapping-based message split are sent using one Adapter Engine. The Java proxy runtime is not supported. This means that the selection of possible target interfaces is restricted to the corresponding adapter types. In particular, no target messages can be sent to an integration process.
The procedure described below requires that the message schemas for the messages to be mapped to each other already exist in the ES Repository (see also Features in Multi-Mappings).
The following restriction applies for the source and target messages that you reference from a message mapping: the source and target messages can be in a different software component version to the message mapping, but must each originate from one software component version (and, if applicable, underlying software component versions).
A multi-mapping that has a message mapping in software component version CRM 3.0, all source messages in software component version APO 2.0, and all target messages in software component version CRM 2.0, complies with the precondition above.
This restriction also applies for the export function of operation mappings, which you use for developing multi-mappings externally, described below.
1. Create a message mapping.
2. In the mapping editor, switch to the Messages tab page.
4. Specify the occurrence for each message.
5. Switch to the Design tab page and edit your message mapping as usual. The rules that apply to message mappings also apply here.
6. Create an operation mapping and reference the operations that use these message schemas. Enter your message mapping in your operation mapping.
Message mappings are not the only means of implementing multi-mappings. Develop the mapping program using the same approach that is described in Multi-Mappings:
1. Create an operation mapping and reference the interfaces that reference the message schemas that are relevant for the multi-mapping. Only target operations of the adapter types that support message packaging are supported.
2. Export the schema of the request message from the operation mapping.
3. Develop the multi-mapping by using the exported schema. The resulting target structure must be structured as is described in multi-mappings.
4. If the mapping is an XSLT or Java mapping (see: Imported Archive (XSLT/Java)), import the mapping program to the ES Repository and reference it from the operation mapping.
You have developed a multi-mapping program and included it in an operation mapping. You can now enter the operation mapping in an interface determination in order to configure a message split (see also: Configuring Mapping-Based Message Splits).