write a BDC program to replace the old description with the new description field in the transaction MM02.
1. In the material master go to MM02 , Select the basic data 1 view and go to additional data .
2. In the language drop down choose language Z1 and against it maintain the Old Description.
3. So at any point of time Description against EN will have the latest description and description against Z1 will have the old description.