Error Handling while using Batch Operation

Hi Experts,

I am trying to update document with multiple successful items using batch operation with single changeset and document is updating successfully.

But when i am trying to update document with multiple unsuccessful items, I am getting error saying " HTTP/1.1 500 Internal Server Error" .

If it is for a single unsuccessful item,i am able to get the error message as return parameter, but i am not able to get the error messages as return parameter  if it is for multiple(more than one item) unsuccessful items.

Could you please let me know your thoughts on this.

Thanks,

Syam