error in edi separator receiver channel string index out of range 3

Hi All,

I have a scenario where the partner is sending the 997 message via AS2 protocol through PI to Mail and SFTP systems. During converting of x12 message to xml below error is coming in the edi receiver channel.

Message could not be forwarded to the JCA adapter. Reason: String index out of range: 3

I referd the blog below in issue #2 is similar to me. But still i'm facing the same issue.

B2B Integration with SAP Process Orchestration

Please provide the inputs where it's going wrong.. Please let me know if any inputs required.

Thanks in advance.

Regards,

Jaya