SharePoint Bug - Publish to source location

From Victor VogelPoel:

In SharePoint (Portal 2003 SP1), Within a document workspace, created from a document using "Create Document Workspace", you can use the "Publish to Source Location" option to publish the document back to its original document library in a Team site. I get, however, the following error: Invalid data has been used to update the list item. The field you are trying to update may be read only.
It appears that a Lookup field in the document library of the Team Site is causing the failure. In the document library of the Team site we've defined a lookup field (to a list in the same Team site); this field is used to categorize the documents. Unfortunately, this lookup field is causing "Publish to Source Location" to fail. Out-of-the-box SharePoint cannot update the source document if the lookup field is present in the document library!

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