Hi Jay,
As per the error, the entry in Table T059Z should be
Country: IN
Withholding Tax Type: E6
Withholding Tax code: P1
From the screenshots you sent to me, the entry is not maintained.
Can you put the above mentioned Parameters in table T059Z and check if you can find an entry there. I assume, it is not there as it is not maintained.
if i am correct, please maintain the entry using the SPRO path i mentioned in one of my reply above.
BR
Amitash