Stopping IDOC Error Messages

[Manoj Rajan]

Hi,
 We are having millions of entries stored in the Workflow tables like SWWIHEAD,
because of IDOC errors such as syntax errors/inbound errors/inbound errors.
These are triggered using status codes such as EDII, EDIO etc and not using
event linkages.We want to completely stop the workflow based notications, is
there a way to deactivate this process?
We are using SAP-4.7 system.
Thanks,
Manoj Rajan