1. Define FI sap data required (all fields required to post the FI document, specifying type length and possible values)
2. Define FI legacy system data available (specifying required data to upload in SAP)
3. Define file data structure base on step 2 and SAP data required specified in step 1
4. One to One field mapping between the SAP data required and the upload file fields.
5. Specify mapping rules, translation tables, and data enrichment required to feed SAP required data not available in the legacy system.
6. Define error handling and monitoring steps for the upload process.
I hope this helps you as a basic help for functional conversion specification.
Aubin
