txn.Rollback

This method is supported by POA starting from version 2.6.3.

This method rolls a transaction back.

There are the following scenarios how a transaction can be rolled back:

During a transaction several methods are called and the last method fails with error. In this case POA automatically rolls the transaction back.
During a transaction several methods are called and all methods are executed successfully. In this case the transaction can be rolled back with the help of the tnx.Rollback method.

The method has the following input parameters:

Name	Type	Short Description
`txn_id`	string	Transaction ID.

The method has no output parameters.