Since the introduction of the IIA version 7 in April 2024, you have the possibility to modify an IIA which was previously mutually approved. In order to modify an IIA which is in “Approved by all” status, you have to find the IIA in the IIA>IIA List menu on the enhanced EWP Dashboard and click on it to open the Single View of it. When you open the Single View of the IIA, find the orange button Modify IIA which is located at the bottom right and click it.
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