100% eou (stpi) - input tax credit

Hi

  Ours is a 100% EOU registered under STPI scheme ( IT and IT enabled services).  We are also doing DTA sales with the permission of STPI .  For all DTA sales we are  collecting and remitting 10.3% ST.  When we adjust input tax with the output tax can we take full amount of input tax for such adjustment? or only a part of it as our main activiy is export.  Pls advice

Thanks

Sreejith