Comment 2 for bug 803788

When I try to uninstall the older one it says:
Integrity Error

The operation cannot be completed, probably due to the following:
- deletion: you may be trying to delete a record while other records still reference it
- creation/update: a mandatory field is not correctly set

[object with reference: wkf_workitem - wkf.workitem]

Could you please tell me what to do, so the older module can be wiped out.
Thanks!