# Lookup field mapping can't update User selection field when source field is Created by or Updated by.

**URL:** <https://forum.kintone.dev/t/lookup-field-mapping-cant-update-user-selection-field-when-source-field-is-created-by-or-updated-by/258>\
**Category:** General\
**Created:** [February 24, 2022, 7:27am UTC](https://forum.kintone.dev/t/lookup-field-mapping-cant-update-user-selection-field-when-source-field-is-created-by-or-updated-by/258 "2022-02-24T07:27:29Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![legacy\_user](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.kintone.dev/legacy_user/32/25_2.png) [@legacy\_user](https://forum.kintone.dev/u/legacy_user)\
**Post date:** [February 24, 2022, 7:27am UTC](https://forum.kintone.dev/t/lookup-field-mapping-cant-update-user-selection-field-when-source-field-is-created-by-or-updated-by/258/1 "2022-02-24T07:27:29Z")

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When lookup mapped field is User selection type, and source field is Created by or Updated by.

The document said the case is supported:

[Fields That Can Be Specified for “Field Mappings” (cybozu.help)](https://jp.cybozu.help/k/en/user/app_settings/form/lookup/otherfield_copy.html)

User selection field can be updated in editor page of Kintone, it can’t be updated successfully by API.

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**Author:** ![Genji](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.kintone.dev/genji/32/646_2.png) [@Genji](https://forum.kintone.dev/u/Genji)\
**Post date:** [February 24, 2022, 9:32am UTC](https://forum.kintone.dev/t/lookup-field-mapping-cant-update-user-selection-field-when-source-field-is-created-by-or-updated-by/258/2 "2022-02-24T09:32:24Z")

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Hello Linner,

Please share the code you are using to make the API call and the error message you are getting.

Thank you

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<div class="post-metadata">

**Author:** ![legacy\_user](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.kintone.dev/legacy_user/32/25_2.png) [@legacy\_user](https://forum.kintone.dev/u/legacy_user)\
**Post date:** [March 1, 2022, 7:55am UTC](https://forum.kintone.dev/t/lookup-field-mapping-cant-update-user-selection-field-when-source-field-is-created-by-or-updated-by/258/3 "2022-03-01T07:55:21Z")

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Hello, Genji,

This is the setting of the lookup field:

![](https://developer.kintone.io/hc/user_images/vIYpgCgJ1mMnAmpKwFGpIA.png)

Invoke the following code, it doesn’t take effect:

```
var body = {
    "app": 59636,
    "id":"353" ,
    "record": {
        "Lookup_0": {
            "value": "253"
        }
    }
};
 
kintone.api(kintone.api.url('/k/v1/record', true), 'PUT', body, function(resp) {
        // success
        console.log(resp);
    }, function(error) {
        // error
        console.log(error);
    });
```

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<div class="post-metadata">

**Author:** ![legacy\_user](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.kintone.dev/legacy_user/32/25_2.png) [@legacy\_user](https://forum.kintone.dev/u/legacy_user)\
**Post date:** [March 2, 2022, 6:29pm UTC](https://forum.kintone.dev/t/lookup-field-mapping-cant-update-user-selection-field-when-source-field-is-created-by-or-updated-by/258/4 "2022-03-02T18:29:38Z")

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Hello Linner,

Your script worked fine for me regardless the source field was “created by” or “updated by.”&nbsp;  
The problem might be due to the settings in your fields or it could be related to permission.

Could you check into that?

Best,  
Chris