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@@ -40,3 +40,4 @@ Specific information:
 - [Troubleshooting data package archival in the vault](troubleshooting-copy-to-vault.md)
 - [Troubleshooting publication](troubleshooting-publication.md)
 - [Troubleshooting replication and revision creation](troubleshooting-replication-revisions.md)
+- [Troubleshooting data package metadata issues in the vault](troubleshooting-vault-metadata.md)
diff --git a/docs/administration/troubleshooting-vault-metadata.md b/docs/administration/troubleshooting-vault-metadata.md
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+---
+parent: Administration Tasks
+title: Troubleshooting problems with vault metadata
+nav_order: 18
+---
+# Troubleshooting problems with updating vault metadata
+
+The vault module in the Yoda portal includes functionality to view
+metadata of a data package using the `Metadata` button. Users with
+datamanager permissions on the vault group's category can also update
+metadata of a data package using the vault module.
+
+There are some situations where this standard functionality cannot be used:
+- The vault group has no data managers, for instance if it belongs to
+  a category that has no datamanager group.
+- The vault group no longer has a research group associated with it.
+- The data package metadata no longer matches the active metadata schema.
+  This can happen after something went wrong with a schema upgrade, for
+  example.
+
+In such cases, a technical admin will need to update the metadata. In older
+versions of Yoda, this was done manually. In Yoda 1.10.0 and later, the
+`edit-vault-metadata` tool can be used to partially automate such updates.
+The sections below describe how to apply this tool in various situations.
+
+## Updating metadata if the group has no data managers
+
+If the vault group does not have a research group anymore or the research
+group category has no datamanager group, the metadata generally can't be updated
+by a datamanager. If an update of the metadata is needed, it will have to be performed by
+a technical admin.
+
+You will have to use the `edit-vault-metadata` tool in direct mode. This
+bypasses the normal process by which metadata is updated by (or on behalf
+of) a datamanager.
+
+Example usage:
+```
+$ /etc/irods/yoda-ruleset/tools/edit-vault-metadata.py --direct /tempZone/home/vault-default-3/testpackage[1722869873]
+```
+
+## Updating metadata that does not match the schema
+
+It is possible to end up with metadata that no longer matches the metadata
+schema in some situations, for example if something went wrong during a metadata
+schema upgrade.
+
+In such cases, the metadata form in the vault module can't be edited using the
+vault module anymore.  However, when a person who has access to the metadata
+(such as a data manager) tries to open the metadata, the portal will typically
+provide an error message that indicate what fields do not match the schema.
+For example:
+
+![Vault module shows metadata validation errors](img/screenshot-schema-mismatch-vault.png)
+
+After checking in the portal to see what fields need to be updated, a technical
+admin can fix these validation errors by editing the metadata. If the vault group
+has a research group and data manager group, the edit tool can
+be used in default mode (without the `--direct` option), otherwise you need to provide
+the `--direct` option. For example, if the vault group's category has a datamanager
+group:
+
+```
+$ /etc/irods/yoda-ruleset/tools/edit-vault-metadata.py /tempZone/home/vault-default-3/testpackage[1722869873]
+```
+
+After any schema validation issues have been resolved by the technical admin, data managers
+will again be able to update the metadata themselves using the vault module.