SFTP Dynamic Filename Configuration Issue

Hi Experts,

I am using SFTP adapter which is provided by SAP as a add-ons, and I have configured FTP to SFTP (Without IR). I have done all the nessary setups in ASMA properties as well , also I have maintained the filename as " * "  in channel adapter parameters. but its writing file in receiver side as *.<timestamp>. as default "localejbs/CallSapAdapter" module is configured, Is it required to maintain any extra Modules , if any please suggest me .

Thanks

Raja