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1. Add a Single/Multiple Answer Lookup Table:
   
2. Click on the "Lookup Table Data" question
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3. Edit the following fields:
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   1. Lookup Table: ignore that for now
   2. Value Field: what you want to save as an answer (usually an id or a code). For locations you can use site_code or @id.
   3. Label Field: what you want to display to the user. For locations you can use name
   (Optional) Filter: can be used to filter the locations displayed.
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   The tricky part is now to modify the xml to point the question to the location table. To do so:
   1. Click on Tools / Edit Source XML on the top right corner of the form builder:
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   2. In the XML search for a select1 node holding your lookup question. It should look like this:
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      In this example my lookup question is /data/location_loookupThen in the expression <itemset nodeset="instance('products')/products/product">, replace the instance with the instance of your location. For exampleclick on the 3 dots next to the field Image Addedand complete the following fields.
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      1. Query expression: put here your location instance. For example:
         1. if you want to display the list of states: instance('locations')/states/state
         2. if you want to display the list of districts of a previously selected state: instance('locations')/states/state[site_code=/data/state_selected]/districts/district
            where /data/state_selected is the state previously selected.

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1. 1. 1. Instance ID: locations
      2. Instance URI: jr://fixture/commtrack:locations
         
         
   2. Value Field: what you want to save as an answer (usually an id or a code). For locations you can use site_code or @id.
   3. Label Field: what you want to display to the user. For locations you can use name
   4. (Optional) Filter: can be used to filter the locations displayed.
      
      

 If you don't see the 3 dots (Image Added), you need to activate a feature flag in your project settings.

Add your project space name to the feature flag 'Allows user to configure itemsets for more than lookup tables', here.