Hi Manas,
Are you able to spy any element other than this window(Like User name, Password, or some fields after login) using SAP Mode?
If yes then there are some window in SAP like which are non editable then you can not able to spy it. Try using Accessibility mode if using that you can not able to achieve your requirement, then generate a script using using SAP GUI Recorder and use it code stage to achieve it.
It is very simple to use.
Let me know if you have any doubts.
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Amlan Sahoo
RPA Consultant
Equinix
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Regards,
Amlan Sahoo