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parameters with LoV : how to print LoV desrciption (not value)

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I have a report parameter make with a Lov  (list of stores : id and description)

ID is used to filter the DataSet (in KA server).

In a birt report I want to print the store-description.

params['Store'].value returns obviuosly the ID.

params['Store'].displayText works only if the DataSet is local to the report, but prints "null" if the DataSet is taken from the Knowage server.

How can I do that ?

thanks.

Environment KnowAge server 6.2.0 - KA report designer 6.2.0
in Reporting by (170 points)

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