unable to update supplier bank and branch using rest api while same is allowed from frontend

Summary:

I need to correct duplicate bank and branch data by deleting the duplicate bank branch records. Before that, I need to replace the duplicated bank and branch name from supplier bank account with the surviving original bank or branch name. this is allowed from the front end, however it is not working with the rest api it gives error like invalid bank or branch identifier.

I can update the branch 123 to 321 within the same bank 001 but I can not change both the bank and branch name. I tried changing the bank name first and then the branch name but it did not worked either.