A custom LU added as a custom tab shows data correctly but can't be edited, even though there was no such restriction on an older application generation.

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Answer

Check whether the custom tab is configured as a Group when it actually needs to be a Singleton — a one-to-one relationship between the page and the custom tab requires the Singleton control type, and using a Group for that relationship has been a confirmed cause of data appearing but not being editable.

Documentation-based answer. Confirm the product and release before applying it. This answer has not been verified in an IFS environment.

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