some times when we want to edit the dvm from composer we will get the below error.
Caused By: javax.ejb.EJBException: EJB Exception: ; nested exception is:
oracle.fabric.common.FabricException: oracle.mds.core.MetadataNotFoundException: MDS-00013: no metadata found for metadata object
Take the back up of the data for the table <MDS_SCHEMA>.MDS_SANDBOXES
Delete the row with the name of the dictionary (or any other dictionary) on the table and commit the changes.