BusinessDataItemBuilder not usable on publishing site

SharePoint BCS out-of-the-box delivers a number of useful webparts to render external data. The BusinessData webparts consistently apply the architecture pattern of data provider and data consumer. A provider-consumer example is that of the BusinessDataItemDetails webpart to render an external data item, connected to a BusinessDataItemBuilder webpart that provides the external data item. The latter applies the 'ID' querystring parameter in the page URL to determine which entity to retrieve from the external administration. A standard example where the 2 webparts are used in this combination are the BCS profile pages.

It appears a sensible approach to use the same webparts combination for rendering an external entity item on a publishing page. However, when opening the page with the 'ID' querystring parameter referencing a BCSidentity:

http://tnvduetenterprise/subsite/Pages/TestSAP.aspx?ID=0aab

SharePoint throws the following error:

PortalSiteMapProvider was unable to fetch current node, request URL: /subsite/Pages/TestSAP.aspx, message: Value cannot be null. Parameter name: key, stack trace: at System.Web.SiteMapNode..ctor(SiteMapProvider provider, String key, String url, String title, String description, IList roles, NameValueCollection attributes, NameValueCollection explicitResourceKeys, String implicitResourceKey) at System.Web.SiteMapNode..ctor(SiteMapProvider provider, String key, String url, String title, String description) at Microsoft.SharePoint.Publishing.Navigation.PortalSiteMapNode..ctor(PortalSiteMapProvider provider, PortalWebSiteMapNode webNode, String key, NodeTypes type, String url, String title, String description) at Microsoft.SharePoint.Publishing.Navigation.PortalSiteMapProvider.get_CurrentNode()

The cause is that the masterpage of publishing site includes PortalSiteMapProvider and PortalSiteMapDataSource. And the latter also reacts on the presence of the 'ID' querystring parameter, but expects a page identification as value instead of the BCS identity.