Hi Alex,
If you still have the schema with all the tables and your user has all the authorization for accesing that schema you can solve this by once of the below steps.
First,
You can create Schema Mapping between SAP_ECC schema and new schema (or BEST schema). For this you can follow below steps
1. Goto Modeler perspective
2. Help menu > Quick View
3. Select Schema Mapping from Quick View
4. Select the systems > click Next
5. Enter SAP_ECC as Authoring Schema and new/BEST as Physical schema
6. Click on Finish
Second,
You can change all the tables in the views pointing to new/BEST schema. For this you can follow below steps
1. Goto Modeler perspective
2. Help menu > Qucik View
3. Select Change Authoring Schema
4. Select your system > click Next
5. Select All the packages having your views using SAP_ECC tables and add them to right side
6. Type Source as SAP_ECC and Target as BEST
7. Click on Finish
8. Activate all views via Activation button in Quick View
Hope this will help you.
Regards,
Rashmi
