Hi Jay,
So as per the screen shots you are setting up a exemption limit as 1,00,000/- INR but while posting the document system is calculating TDS of 30% on total value.
Can you quickly check if we have already posted some documents to the same Vendor from 01.04.2014 to 31.12.2014.
This would mean that exemption limit is exhausted.
If still you are getting the same error i would suggest that try creating a new Vendor and test if that is working fine.
Thanks,
Vishal Maheshwari