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Use this event to

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    [EventSubscriber(ObjectType::Codeunit, Codeunit::"MOB WMS Put Away", 'OnGetPutAwayOrderLines_OnAddStepsToWarehouseActivityHeader', '', true, true)]
    local procedure OnGetPutAwayOrderLines_OnAddStepsToWarehouseActivityHeader(_WhseActivityHeader: Record "Warehouse Activity Header"; var _StepsElement: Record "MOB Steps Element")
    begin
        // Add your custom header steps here...
        // _StepsElement.Create....
        ;
    end;

Usings steps in code

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