Not sure about ISeries. Sounds like you need to migrate tables.
As for Wherescape -- migration TO wherescape from anywhere will 1.be done manually 2. end up retrofitting the source tables. 3. the etl and other stages will be re-created.
It occurs to me you will need to re-write the whole thing.
M.Sc.IT, M.B.A, MCTS BI 2008, MCITP BI 2008, MCTS SQL Dev, CSM, CDVDM