Smartform for PO Faxing thrw RightFax -Error

Hi Friends

I am sending PO smartform thrw Righfax server for Fax , here i have successfully sent FAX ,but problem is in the rightfax server log there is Sending/created user inforamtion(USER INFORAMTION) missing . What i need to pass paramaters for this PO smartform.In COMPOSE_PARAMS---TDFAXUSER has the value and showing at SOST tcode .In the Rightfax log the uesr is missing . Any body have any clue in this .This is urgent please responsd if any body faced this type of issue.

Regards

RK