# Controlling CDR content creation

**Category:** [SM](https://discourse.openehr.org/c/service-model/82)
**Created:** 2022-02-21 17:36 UTC
**Views:** 409
**Replies:** 0
**URL:** https://discourse.openehr.org/t/controlling-cdr-content-creation/2382

---

## Post #1 by @thomas.beale

From the SEC call today, a discussion on a very interesting topic: how would a CDR limit creation of a particular kind of (say) persistent Composition (e.g. Medications list) to one effective instance in the system?

[Wiki discussion here](https://openehr.atlassian.net/wiki/spaces/spec/pages/1970765848/Rules+for+Controlling+Content+Creation+in+a+CDR).

---


**Canonical:** https://discourse.openehr.org/t/controlling-cdr-content-creation/2382
**Original content:** https://discourse.openehr.org/t/controlling-cdr-content-creation/2382