DAU user credentials GUID not cleared from Windows bundle metadata

Windows bundle action is configured to Run as dynamic administrator and the Select credential for network access is populated.
The bundle is configured in a ZENworks Subscription to replicate to another zone.

Delete the select credentials from the credential vault.

Symptom:
The bundle fails to replicate.

Error:
Error message in loader-messages.log:
"...
[INFO] [05/04/2015 12:22:33.946] [3280] [ZENLoader] [243] [] [Replicate Subscriptions : /Subscriptions/Import_PROD/GetProdContent (wGUID)] [Failed to replicate the object Bundle Office-PushInstallRepository. due to unresolved issues] [Failed to replicate the object Bundle Office-PushInstallRepository. due to unresolved issues] [] [] [] [ZENServer]
[TRACE] [05/04/2015 12:22:33.983] [3280] [ZENLoader] [243] [] [Replicate Subscriptions : /Subscriptions/Import_PROD/GetProdContent (wGUID)] [] [Failed to persist issues of the object Office-PushInstallRepository.] [] [] [] [ZENServer]
[TRACE] [05/04/2015 12:22:33.983] [3280] [ZENLoader] [243] [] [Replicate Subscriptions : /Subscriptions/Import_PROD/GetProdContent (wGUID)] [] [java.lang.NullPointerException
    at com.novell.zenworks.subscriptionSession.zone.handler.ZSORepHandler.getRepIssueMappings(ZSORepHandler.java:531)
..."

Workaround:
Edit the bundle action and press the clear button next to the Select credential for network access field while field shows as empty. Alternatively you can also select a good credential set.

While it is not longer visible in ZCC that DAU network credentials had been configured on the bundle action, a related reference is still stored in the bundle metadata in the SQL database.