Hi
I had this same problem. I did not solve it by any of the suggestions put forward so I thought I would try and help others who might have this same problem. I was doing a system copy with ERP 6.0 ehp 7 simple finances 1.0 on HANA. My problem was that I did not put the schema from the HANA backup but wanted to use another. ie. the schema from the source system sapabap1 but I entered sapbla1 and since it let me continue I thought it would rename the schema during the system copy.
To fix this I had to change the connection from the application server using rsecssfx. More about using rsecssfx can be found in sap note 1639578 - SSFS as password store for primary database connect.
Use R3trans -d and R3trans -x to verify the connection. You will also need to use hdbuserstore list before setting the user, password and default db connection with rsecssfx and check afterwards with hdbuserstore list to confirm the entries are correct.