# RESOURCE_DESCRIPTION.parent_resource is mandatory but value is missing in templates

**Category:** [RM](https://discourse.openehr.org/c/rm/42)
**Created:** 2021-12-26 18:49 UTC
**Views:** 484
**Replies:** 1
**URL:** https://discourse.openehr.org/t/resource-description-parent-resource-is-mandatory-but-value-is-missing-in-templates/2230

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## Post #1 by @borut.jures

RESOURCE_DESCRIPTION.parent_resource is mandatory but value is missing in templates

[RESOURCE_DESCRIPTION](https://specifications.openehr.org/releases/BASE/latest/resource.html#_resource_description_class) has attribute "parent_resource" as mandatory.

This attribute is not provided in templates (e.g. openEHR-EHR-COMPOSITION.encounter.v1.0.7.adls).

Should the attribute RESOURCE_DESCRIPTION.parent_resource be optional in "openehr_base_110.bmm"?

Maybe I don't understand what its value should be?

It has a "comment" in the specifications: `{default = }` but the default value is not provided.

And the "Meaning" says: "Reference to owning resource." Type of "parent_resource" is not a reference but a copy by value of an AUTHORED_RESOURCE.

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## Post #2 by @thomas.beale

[quote="borut.jures, post:1, topic:2230"]
RESOURCE_DESCRIPTION.parent_resource is mandatory but value is missing in templates
[/quote]

This should be fixed in the UML; it is a reverse reference that can only be constructed on instantiation, and cannot be persisted. Normally these kind of refs are shown in blue - seems this one is not. You can ignore it for any schemas representing persistent data.

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**Canonical:** https://discourse.openehr.org/t/resource-description-parent-resource-is-mandatory-but-value-is-missing-in-templates/2230
**Original content:** https://discourse.openehr.org/t/resource-description-parent-resource-is-mandatory-but-value-is-missing-in-templates/2230