JDBC Error: Adapter Runtime (Metadata): Unable to lookup the

We are using JDBC adapter to connect to DB2 tables running on AS 400 systems. The tables (files as they call on AS400)have members defined and each member has aliases defined. If we were to insert rows into the tables directly, there is no issue with it. However if we were to insert data in to a particular member using the alias defined for it, causes WebMethods to bomb out giving the following error: “Adapter Runtime (Metadata): Unable to lookup the resource domain values 309
on update.inputColumn [Ljava.lang.String;@12d6772. java.lang.Exception: Adapter values are not available.”. Any suggestions??