# Question about the list lookup function

**URL:** <https://community.yeeflow.com/t/question-about-the-list-lookup-function/62>\
**Category:** Ask the community\
**Created:** [November 29, 2021, 1:59am UTC](https://community.yeeflow.com/t/question-about-the-list-lookup-function/62 "2021-11-29T01:59:13Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![john55ww](https://avatars.discourse-cdn.com/v4/letter/j/b9e5f3/32.png) [@john55ww](https://community.yeeflow.com/u/john55ww)\
**Post date:** [November 29, 2021, 1:59am UTC](https://community.yeeflow.com/t/question-about-the-list-lookup-function/62/1 "2021-11-29T01:59:13Z")

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Hi,  
I am constructing function that list up the matched rows from a data list to a form.

First, I directly used the listlookup to figure it.  
 ![image](https://canada1.discourse-cdn.com/flex032/uploads/yeeflow/original/1X/c0ee6b6f51edba2fd5bc003acbccc57cdb1fdf4c.png)  
The filter is set as below.

 ![image](https://canada1.discourse-cdn.com/flex032/uploads/yeeflow/original/1X/7aaeccd62f2c98d01fee193aff65a5f9334eab58.png)  
However, whatever filter I set, the result always showing ‘ERR’.(Even set as always true)

Maybe listlookup is not suitable for this feature.  
Then I tried the ‘News’ Block to list up the same thing.  
 ![image](https://canada1.discourse-cdn.com/flex032/uploads/yeeflow/original/1X/5b85a346e8f878a62d1a35a278ab510c597e47d1.png)  
It will show something if I do not set the filter,  
but nothing as long as I set anything in the filter.

Could anyone tell me how to use these features?

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**Author:** ![Claire\_Cheung](https://avatars.discourse-cdn.com/v4/letter/c/b487fb/32.png) [@Claire\_Cheung](https://community.yeeflow.com/u/Claire_Cheung)\
**Post date:** [November 30, 2021, 2:10am UTC](https://community.yeeflow.com/t/question-about-the-list-lookup-function/62/2 "2021-11-30T02:10:01Z")

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1. Is it the same type in your form and your data list?
2. Do you set ‘OS’ as the index in your data list?
3. The field of ‘OS’ is single/multiple data?

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**Author:** ![john55ww](https://avatars.discourse-cdn.com/v4/letter/j/b9e5f3/32.png) [@john55ww](https://community.yeeflow.com/u/john55ww)\
**Post date:** [November 30, 2021, 3:12am UTC](https://community.yeeflow.com/t/question-about-the-list-lookup-function/62/3 "2021-11-30T03:12:53Z")

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After I set fields as index, it works.  
Thank you very much.

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<div class="post-metadata">

**Author:** ![Claire\_Cheung](https://avatars.discourse-cdn.com/v4/letter/c/b487fb/32.png) [@Claire\_Cheung](https://community.yeeflow.com/u/Claire_Cheung)\
**Post date:** [November 30, 2021, 3:28am UTC](https://community.yeeflow.com/t/question-about-the-list-lookup-function/62/4 "2021-11-30T03:28:53Z")

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Good to hear that! 😄