Hello Puja,
As per Jurgen's reply, please look into the long text of the message in SE91., it explains you in detail.
Also when you look into the Exceptions tab in the function module in SE37, it says that "TO item is not withdrawal from SU block storage".
You have taken case 3 from the table documentation to fill the above values mentioned by you.
I guess you can try with other applicable cases and see whether the transfer happens as expected or not.
Regards,
Thanga