# \[API error 400\] The parameter planperiod\_start is generated and cannot be used in a filtering

**URL:** <https://community.rentman.io/t/api-error-400-the-parameter-planperiod-start-is-generated-and-cannot-be-used-in-a-filtering/55>\
**Category:** Developers & API\
**Created:** [June 5, 2026, 12:55pm UTC](https://community.rentman.io/t/api-error-400-the-parameter-planperiod-start-is-generated-and-cannot-be-used-in-a-filtering/55 "2026-06-05T12:55:31Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Alexandre\_FLEURET](https://yyz2.discourse-cdn.com/flex056/user_avatar/community.rentman.io/alexandre_fleuret/32/39_2.png) [@Alexandre\_FLEURET](https://community.rentman.io/u/Alexandre_FLEURET)\
**Post date:** [June 5, 2026, 12:55pm UTC](https://community.rentman.io/t/api-error-400-the-parameter-planperiod-start-is-generated-and-cannot-be-used-in-a-filtering/55/1 "2026-06-05T12:55:31Z")

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Hello,

My prompt is :

"Do you have any projects planned for June 2026? "

or

"Please provide me with a PDF of all the staff scheduled for next week across all projects in Rentman. "

And what I have is this :

“{“action”:“list”,“filter”:{“planperiod\_start[gte]”:“2026-06-01”,“planperiod\_start[lte]”:“2026-06-30”},“fields”:“id,name,planperiod\_start,planperiod\_end”,“limit”:1500}”

{“value”:“Error executing tool rentman\_projects: Error: API error 400: {“errorType”: “string”, “errorMessage”: “[400] The parameter planperiod\_start is generated and cannot be used in a filtering query”, “trace”: }”}

> **[Planification projets juin 2026](https://chat.mistral.ai/chat/224625a5-d0f3-4373-ac3b-0bb3cebfb085)**
>
> Vibe (formerly Le Chat) is your AI agent for work and code.

Do you have any idea how to proceed ?

Same error with ChatGPT, Claude and Mistral.

Thanks.

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**Author:** ![Alexandre\_FLEURET](https://yyz2.discourse-cdn.com/flex056/user_avatar/community.rentman.io/alexandre_fleuret/32/39_2.png) [@Alexandre\_FLEURET](https://community.rentman.io/u/Alexandre_FLEURET)\
**Post date:** [June 8, 2026, 8:24am UTC](https://community.rentman.io/t/api-error-400-the-parameter-planperiod-start-is-generated-and-cannot-be-used-in-a-filtering/55/2 "2026-06-08T08:24:41Z")

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Hello,

Any help on this ?

Thanks.

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**Author:** ![Ilinca](https://yyz2.discourse-cdn.com/flex056/user_avatar/community.rentman.io/ilinca/32/23_2.png) [@Ilinca](https://community.rentman.io/u/Ilinca)\
**Post date:** [June 8, 2026, 1:28pm UTC](https://community.rentman.io/t/api-error-400-the-parameter-planperiod-start-is-generated-and-cannot-be-used-in-a-filtering/55/3 "2026-06-08T13:28:17Z")

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Hello! Thank you for reaching out @Alexandre_FLEURET and sharing your experience. We are working on a fix, but in the meantime you could tell your AI that they should not try to use computed/aggregated/derived fields in searches. This will hopefully prompt the agent to try a different route. Could you please try and let us know if it worked?

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**Author:** ![Alexandre\_FLEURET](https://yyz2.discourse-cdn.com/flex056/user_avatar/community.rentman.io/alexandre_fleuret/32/39_2.png) [@Alexandre\_FLEURET](https://community.rentman.io/u/Alexandre_FLEURET)\
**Post date:** [June 9, 2026, 7:23am UTC](https://community.rentman.io/t/api-error-400-the-parameter-planperiod-start-is-generated-and-cannot-be-used-in-a-filtering/55/4 "2026-06-09T07:23:21Z")

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Better yes. Really slow to answer but it’s working. it seems to request a lot of data for one question. Requested all projects. Should be better to have a timeframe window request.