# Set a SLOT (CLUSTER) to mandatory

**Category:** [Ask IEB](https://discourse.openehr.org/c/ask-ieb/37)
**Created:** 2024-07-17 14:30 UTC
**Views:** 32
**Replies:** 2
**URL:** https://discourse.openehr.org/t/set-a-slot-cluster-to-mandatory/5485

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## Post #1 by @emmanuel.eschmann

Can a SLOT (CLUSTER) be set to mandatory, i.e. its ‘Occurrences’ set to ‘1..*’?

The following screenshot shows a very simple ‘Blood pressure’ template with an enclosed blood pressure observation archetype. I have added an ‘Anatomical location’ cluster archetype in its ‘Structured measurement location’ slot. To make the entry of an anatomical location mandatory, I would like to constrain the ‘Occurrences’ of the slot to `‘1..*’`. However, every time I modify this ‘Occurrences’ to `‘1..*’`, it reverts to `‘0..*’`.

Questions:

1. Is the constraining of ‘Occurrences’ of a slot supported by ADL (i.e. is the described problem an error of the Archetype Designer (https://tools.openehr.org/designer/))?
2. What other option is there to make content mandatory for the ‘Anatomical location’ in the ‘Structured measurement location’ slot?

![image|690x432](upload://yowDE2WoMPVkzdaRyTyJD7tVE1i.jpeg)

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## Post #2 by @ian.mcnicoll

Just make the Anatomical location cluster archetype, which fills the slot, mandatory.

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## Post #3 by @emmanuel.eschmann

[quote="ian.mcnicoll, post:2, topic:5485"]
Anatomical location cluster archetype
[/quote]


I have already set the ‚Occurences‘ of the Anatomical location cluster archetype to ‚1..1‘  (see screenshot: Element with light blue background):
![image|690x323](upload://aVJS9WBj9bwk4ucRkJqSrY0RZLm.png)

 
And I have even set the ‚protocol‘ node to ‚Mandatory‘ (see screenshot: node with light blue background):
![image|690x479](upload://bDoyOu5tmnVP5dnVZ2wfTQda0gF.png)

But I can still create compositions based on this template with no ‘Anatomical location’ on our openEHR CDR.

I do attach the Template Fileset and the post body of the example composition to this post to illustrate this:
Template Fileset: 
[Blood pressure.opt|attachment](upload://zg6ebHiFN9QXyUla2g0hu5n4k1t.opt) (100.5 KB)

post body of the example composition with missing ‘Anatomical location’: 
[Blood pressure Composition.json|attachment](upload://rEAfQ3mjNOJQibZdEd6YMeqznW4.json) (1.5 KB)

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**Canonical:** https://discourse.openehr.org/t/set-a-slot-cluster-to-mandatory/5485
**Original content:** https://discourse.openehr.org/t/set-a-slot-cluster-to-mandatory/5485