When trying to update an additional asset pick-list field using REST API I receive an error message:

<?xml version="1.0" encoding="UTF-8"?>
<API version="1.0" >
 <citype>
  <name>Tunn</name>
  <criterias>
   <criteria>
    <parameter>
     <name compOperator="IS">CI Name</name>
     <value>NX21655</value>
    </parameter>
   </criteria>
  </criterias>
  <newvalue>
   <record>
    <parameter>
     <name>Adress</name>
     <value>Valfisken</value>
    </parameter>
   </record>
  </newvalue>
 </citype>
</API>

{
  "API": {
    "version": "1.0",
    "response": {
      "operation": {
        "name": "update",
        "result": {
          "statuscode": "3001",
          "status": "Unknown error.",
          "message": "java.sql.SQLException: The data types ntext and nvarchar are incompatible in the equal to operator."
        }
      }
    }
  }
}