Error SBL-EAI-13000 at EAI Data Transformation Engine - Execute step

Hi,

I am trying to convert and external XML IO to a Siebel IO using Data Transformation Engine service. Both XML IO and Siebel IO have Service Request Attachment IC and ActivityBuffer as attachment field. But data transformation step is giving below error. Though the same base64 attachment is working with other Inbound Webservice where only Siebel IO is used.

<siebelf:error>

<siebelf:errorcode>SBL-BPR-00162</siebelf:errorcode>

<siebelf:errorsymbol/>

<siebelf:errormsg>Error invoking service 'EAI Data Transformation Engine', method 'Execute' at step 'SIM REG New Cust Datamap'.(SBL-BPR-00162)</siebelf:errormsg>

</siebelf:error>

<siebelf:error>

<siebelf:errorcode>SBL-EAI-13000</siebelf:errorcode>

<siebelf:errorsymbol/>