Schema validation

I have created a XML schema from backend database using XML spy and corresponding webMethods schema and document (in developer) from it to carry out a data validation operation. While I am carrying out the validate operation the error that I am receiving is as follows. As input, I am providing the webMethods document to *object input of validate service,fully qualified name of XML schema to conformsTo input and fialIfInvalid as TRUE. Since this is such a straight forward process, I had never encountered an error in this service before. Does any body has nay clue to this ?

[ISS.0062.9024] Integration Server does not support this type of object in validation