During Explore/CorrelateCreate only the eTGlobalUserName and eTUserID will have values. So you should do the following:
- In the IM UserDir XML relax the retriction so that additional fields are not required (you can leave required on the screen definition)
- Either use a PX Policy of type=UI on Submission of the Provisioning Create User task to set initial values for any additional required fields, or on the screen definition associated with the Provisioning Create User task configure default values for the additional required fields.
If you need further assistance I suggest opening a support case.