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error when doing extension for form

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Hi,

I have a form that has multiple extensions from different models.

When i created a new model (Model X) and created an extension of that form without doing anything extra other than creating the extesniosn, i get these two errors:

A control modification's name must be a control in the base form

for form extension control 'FormExtensionControlvkcmvd6' it's previous sibling 'TabPageABC' was not found as child control of 'design'

this TabPageABC exists in one of the other model extensions (model Y)

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Dynamics 365 Finance

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Mohamed Amine Mahmoudi 26,348 Super User 2025 Season 2 on at

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error when doing extension for form

Hi,

You must add reference of model Y to model X.

Best regards,

Mohamed Amine MAHMOUDI

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.. 1,907 on at

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error when doing extension for form

Hi,

The reference is already there.

I'm not sure why u marked the answer as verified. The answer didn't solve my issue.

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Mohamed Amine Mahmoudi 26,348 Super User 2025 Season 2 on at

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error when doing extension for form

Hi,

Make shure that the models in same layer,

Best regards,

Mohamed Amine MAHMOUDI

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André Arnaud de Cal... 299,576 Super User 2025 Season 2 on at

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error when doing extension for form

Hi,

Can you explain what steps you took to create the new model (X) and what changes you have as form extension? Or did you only create a new extension without any modifications yet?

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Martin Dráb 236,570 Most Valuable Professional on at

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error when doing extension for form

Note that the layers are irrelevant. You surely can have an extension in a different layer than the original element. For example, we all commonly extend objects from SYS layer and our models are in layers like VAR, CUS or USR.

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Ahmer 86 on at

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error when doing extension for form

have you found the solution to this problem yet?

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