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Power Automate - AI Builder (Prompt) Issue: "Run a Prompt" action injecting item/source text

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Posted on by JL-19081337-0 2

We are facing an issue with a Cloud flow where we are using a Prompt to extract data off of PDF documents. the "Run a Prompt" action is injecting an extra parameter by itself and every run fails. This happens in new flows and existing ones; even the basic preconfigured prompts fail, so it’s not due to my custom mapping.

What gets added automatically:

Field shown in the action as item.item/source, value:

{"consumptionSource":"PowerAutomate","partnerSource":"AIBuilder",
"consumptionSourceVersion":"Flow",
"partnerSourceVersion":"28214da3-87df-433c-bc09-0be2065c2f01",
"displayName":"Cold-Mail-Outreach-Flow"}
 

In the code view / request payload this becomes a top-level parameter item/source, which OData rejects.

Error

400 Bad Request (0x80048d19)
The parameter 'item/source' in the request payload is not a valid parameter for the operation 'Predict'.
 

Please assist if you are aware of a fix for this issue!  We have tried the following without success:

- Logging out and back in

- Toggling between New Designer and Classic Designer Modes

- Rebuilding prompts from scratch.

image (4).png
Screenshot 2025-08-19 at 07.28.12 1.png
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I have the same question (0)
  • JG-07041814-0 Profile Picture
    JG-07041814-0 2 on at
    I am experiencing this and thought it was causing a similar error, particularly in deployment and activation of a flow. However, it was being caused by a change when I copied over an unbound action. Has this continued to cause issues?

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