To change Data source to point to another source system

hi all,

I am looking for best feasible option.

I have my all flow and reports moved to quality, then in UAT, user could not find the desired data to test the reports as the ECC quality was last refreshed more than a year.

BW quality is connected to ECC A and ECC B--> ECC A contains no data and ECC B contains data

Then I am being asked to change the source system ECC B

Now my query is do I need to change the whole flow and change the data source for ECC B

or is there any way to do this.

As in BW quality I have data source pointing to two source systems; so I tried to delete the data source from source system that contains no data, but could not as it is deleting with all dependent objects.

,

Please suggest.

Thanks,

Ambika