Migration is an open interface for transferring master data and transaction data to IS-U. The outflow is orientated around the target system IS-U. This means that the data model, or the function of the legacy system for migration is neither required nor used.
The migration procedure cannot run based on tables, because of the relational SAP system data model and the considerable complexities it contains. Instead it has to compile related data in such a way as to guarantee consistency in the data after the transfer.
The data is compiled into migration objects for the migration into the SAP application. In these units the data is transfered into the SAP system. At the same time, special service function modules have been created in IS-U for the business objects of this application. They make an object-orientated transfer possible. These modules operate in direct input mode and can thus avoid the performance disadvantages of batch input processes.
The structure of a migration object is defined in controlling tables delivered by SAP. It can consist of several SAP structures. You can find all the structures connected with a migration object in the dictionary. User-defined enhancements (fields) are taken into account at the same time.
Data can be extracted from the legacy system using user-defined extraction programs. The exact record structure is determined per table settings in the Migration Workbench (transaction EMIGALL). Data sets that have been generated in this way, and transfered to your target computer by file transfer, are read and processed in the SAP system by the import program, which is generated by the customer system. The code conversion (EBCDID to ASCII) is carried out at the same time. The data is then formatted and transfered to the direct input module.
So, IS-U Migration work bench represents an open interface & works with the business objects instead of database tables and with direct input instead of batch input. The Customizing & execution of ISU – Migration Work bench using T-code EMIGALL includes the following process steps
1. The Scope of ISU - Migration
2. The Concept of Migration Object
3. The Technology
4. Migration Customizing
5. Using the IS-U Migration Workbench
6. Migration Project
7. Migration Objects
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Purpose of this document is to provide a complete step-by step guidance for T-code EMIGALL for configuring the ISU – Migration Work bench & use it as a tool, for loading IS-U master and transactional data from one or more legacy system(s).
