# Allow to constraint DV_IDENTIFIER issuer, type, assigner

**Category:** [Archetype Designer](https://discourse.openehr.org/c/archetype-designer/30)
**Created:** 2025-07-11 16:59 UTC
**Views:** 30
**Replies:** 0
**URL:** https://discourse.openehr.org/t/allow-to-constraint-dv-identifier-issuer-type-assigner/6984

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## Post #1 by @pablo

HI, I'm using the archetype designer and it doesn't seem possible to set a C_STRING constraint over the fields of a DV_IDENTIFIER, only free text / fixed values are allowed.

![Screenshot_2025-07-11_13-57-33|380x398](upload://emgaSrMXySn8wVMJoVfXtlQTakk.png)


Is it possible to add support for such constraints?

Thanks!

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**Canonical:** https://discourse.openehr.org/t/allow-to-constraint-dv-identifier-issuer-type-assigner/6984
**Original content:** https://discourse.openehr.org/t/allow-to-constraint-dv-identifier-issuer-type-assigner/6984