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Celerra NFS and VDM

Just to share with you something I have found out the hard way.
It is not possible to create a nfs export of a file system that is on a VDM (cf EMC doc p 13 Configuring NFS on EMC Celerra 5.6.46)

However it is possible to trick the system using some hidden references to the vdm path.
For instance, to create an export of the FS named prod_public on a vdm, I had to do the following:

[nasadmin@xxxpemccs01 ~]$ server_export xxxpemc01dm01a -P nfs -n vdmpublic -o anon=0 /root_vdm_3/prod_public
xxxpemc01dm01a : done

xxxpemc01dm01a is the name of the DM
and root_vdm_3 is the hidden path the vdm structure. 3 is supposed to be the sequence number of the VDM. I was expecting 1 but somehow it is 3, perhaps we had created from VDM in the past.