# Missing type id property '\_type' (for POJO property 'items') in EHRBase

**URL:** https://discourse.openehr.org/t/missing-type-id-property-type-for-pojo-property-items-in-ehrbase/3125
**Category:** General Discussion
**Tags:** ehrbase
**Created:** [2 November 2022 14:47 UTC](https://discourse.openehr.org/t/missing-type-id-property-type-for-pojo-property-items-in-ehrbase/3125 "2022-11-02T14:47:17Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![surfer](https://discourse.openehr.org/user_avatar/discourse.openehr.org/surfer/32/2326_2.png) [@surfer](https://discourse.openehr.org/u/surfer)
#### Post date: [2 November 2022 14:47 UTC](https://discourse.openehr.org/t/missing-type-id-property-type-for-pojo-property-items-in-ehrbase/3125/1 "2022-11-02T14:47:18Z")

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Hi,  
I start by saying that I already checked the similar “Missing type id property error in Ehrbase” .

My couple template/composition is at this link: [Upload Files | Free File Upload and Transfer Up To 20 GB](https://easyupload.io/v3ufjy)

The template has been created with the free Archetype Designer. The composition is derived , through the example method, from the template.

The composition can be posted successfully but it cannot be retrieved.

The GET returns the error:  
“error”:“Bad Request”,“message”:“DB inconsistency:java.lang.IllegalArgumentException: Could not resolve subtype of [simple type, class com.nedap.archie.rm.datastructures.Item]: missing type id property ‘\_type’ (for POJO property ‘items’)\n at …… [truncated 9757 chars]; line: 3, column: 8681] (through reference chain: com.nedap.archie.rm.composition.Composition["content"]-\>java.util.ArrayList[0]-\>com.nedap.archie.rm.composition.Observation["protocol"]-\>com.nedap.archie.rm.datastructures.ItemTree["items"]-\>java.util.ArrayList[0]-\>com.nedap.archie.rm.datastructures.Cluster["items"]-\>java.util.ArrayList[0])”  
The error position could be useful if it pointed to the culprit of the problem but just gives a generic problem with items, but which items and what problem ? there are a lot of items in the template.

Any idea of what is going wrong?

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### Author: ![surfer](https://discourse.openehr.org/user_avatar/discourse.openehr.org/surfer/32/2326_2.png) [@surfer](https://discourse.openehr.org/u/surfer)
#### Post date: [2 November 2022 15:15 UTC](https://discourse.openehr.org/t/missing-type-id-property-type-for-pojo-property-items-in-ehrbase/3125/2 "2022-11-02T15:15:34Z")

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Turned out that if I remove all \_uid the composition is retrieved correctly as in " [Missing fields in uploaded composition](https://discourse.openehr.org/t/missing-fields-in-uploaded-composition/2925)"