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Header display method not refreshing when calculated Line data changes

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I have a custom form in Dynamics 365 Finance & Operations.

The Header has a display method that aggregates values from Lines.
The values on the Line are calculated (display/computed) and not stored in the database.

The issue is that the Header display method only recalculates when the active record changes (for example, when switching lines),

but it does not update immediately when a Line is added, modified, or deleted.

My question is:

What is the correct and recommended approach in D365FO to force a Header display method to recalculate immediately when Line data changes, without relying on record navigation?

Thank you.

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Dynamics 365 Finance

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Martin Dráb 239,040 Most Valuable Professional on at

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You can call observe() method of the line data source in your display method. Refer to Display methods and Form Observability, for example, for more details.

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Martin Dráb 239,040 Most Valuable Professional on at

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I see you asked about a similar thing a few days ago in Child grid calculated field not refreshing when parent changes and I gave you the same answer, which you verified as a solution of the problem.

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