How does an enhancement of datasource affect my production data

Hello All,

We have enhanced a datasource 2LIS_11_VAITM, I want to know what will happen to my existing data in the production after i move the enanced datasource to production???

will i need to clear the existing data in production after moving the same to another dummy cube O r will just running the deltas bring in the data for the enhanced fields as well without disturbing the existing data...

Please respond. The issue is very critical..