CMDB REST API - Get Asset Status

CMDB REST API - Get Asset Status

Hi, i'm using the API for "Get CI Details using criteria". I´m adding "Asset State" as a tag in the XML for returnparameters, but I dont get any value back.
Any special reason to why that dont work?

...
</criterias>
<returnparameters>
<name>CI-ID</name>
<name>CI Name</name>
<name>CI Type</name>
<name>Site</name>
<name>Description</name>
<name>Asset State</name>
........

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