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Steps to reproduce: . Get the attached project (VSM+ecore+aird) . Open the session . Open the existing diagram Its description declare an import mapping to import a list ContainerMapping from another diagram in the VSM: the hideSubMappings attribute is not enabled, we should see some list elements and a border node.
It miss a project in attachement.
Created attachment 248891 [details] Reproduction case The diagram showing errors is 447849 - Import mapping with issue
Reproduced on Sirius master. The bug seems there for a while. the call of org.eclipse.sirius.diagram.business.internal.componentization.mappings.DiagramMappingsManagerImpl.getNodeMappings(DNodeList, boolean) within org.eclipse.sirius.diagram.business.internal.componentization.mappings.DiagramMappingsManagerImpl.getNodeMappings(DNodeList) is done with takeAlsoChildrenOfAllImportedMappings=false. But there is also an other issue since the descriptionMappings list is empty (l.190 of DiagramMappingsManagerImpl)