diff --git a/src/components/dialogs/commons/modificationDialog.tsx b/src/components/dialogs/commons/modificationDialog.tsx
index f47295c3dd..5e35a85583 100644
--- a/src/components/dialogs/commons/modificationDialog.tsx
+++ b/src/components/dialogs/commons/modificationDialog.tsx
@@ -5,7 +5,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 
-import { useCallback } from 'react';
+import { PropsWithChildren, useCallback } from 'react';
 import { FieldErrors, FieldValues, useFormContext } from 'react-hook-form';
 import { SubmitButton } from '@gridsuite/commons-ui';
 import { ModificationDialogContent, ModificationDialogContentProps } from './modification-dialog-content';
@@ -16,6 +16,13 @@ import { ModificationDialogContent, ModificationDialogContentProps } from './mod
  * @param {CallbackEvent} onClear callback when the dialog needs to be cleared
  * @param {CallbackEvent} onSave callback when saving the modification
  * @param {Boolean} disabledSave to control disabled prop of the validate button
+ * @param {Boolean} readOnly when true, forces the validate button to be disabled.
+ * Actual form-input disabling is intentionally NOT done here: wrapping all of
+ * `children` (which can include tab navigation, action buttons, etc.) in a
+ * disabled fieldset at this generic level would also disable that navigation.
+ * Each dialog's content should instead read `readOnly` from
+ * useCustomFormContext() and scope its own fieldset around just the actual
+ * form fields (see LineForm for an example).
  * @param {CallbackEvent} onValidated callback when validation is successful
  * @param {CallbackEvent} onValidationError callback when validation failed
  * @param {Array} dialogProps props that are forwarded to the MUI Dialog component
@@ -26,6 +33,7 @@ export type ModificationDialogProps<TFieldValues extends FieldValues> = Omit<
     'closeAndClear' | 'submitButton'
 > & {
     disabledSave?: boolean;
+    readOnly?: boolean;
     onClear: () => void;
     onClose?: () => void;
     onSave: (modificationData: TFieldValues) => void;
@@ -35,13 +43,15 @@ export type ModificationDialogProps<TFieldValues extends FieldValues> = Omit<
 
 export function ModificationDialog<TFieldValues extends FieldValues>({
     disabledSave = false,
+    readOnly = false,
     onClear,
     onClose,
     onSave,
     onValidated,
     onValidationError,
+    children,
     ...dialogProps
-}: Readonly<ModificationDialogProps<TFieldValues>>) {
+}: Readonly<PropsWithChildren<ModificationDialogProps<TFieldValues>>>) {
     const { handleSubmit } = useFormContext<TFieldValues>();
 
     const closeAndClear = () => {
@@ -84,8 +94,13 @@ export function ModificationDialog<TFieldValues extends FieldValues>({
             data-testid="ValidateButton"
             onClick={handleSubmit(handleValidate, handleValidationError)}
             variant="outlined"
-            disabled={disabledSave}
+            disabled={disabledSave || readOnly}
         />
     );
-    return <ModificationDialogContent closeAndClear={closeAndClear} submitButton={submitButton} {...dialogProps} />;
+
+    return (
+        <ModificationDialogContent closeAndClear={closeAndClear} submitButton={submitButton} {...dialogProps}>
+            {children}
+        </ModificationDialogContent>
+    );
 }
diff --git a/src/components/dialogs/network-modifications/line/modification/line-modification-dialog.tsx b/src/components/dialogs/network-modifications/line/modification/line-modification-dialog.tsx
index ee6420d893..de9ca0a9dc 100644
--- a/src/components/dialogs/network-modifications/line/modification/line-modification-dialog.tsx
+++ b/src/components/dialogs/network-modifications/line/modification/line-modification-dialog.tsx
@@ -54,6 +54,12 @@ interface LineModificationDtoWithId extends LineModificationDto, WithModificatio
 
 export type LineModificationDialogProps = EquipmentModificationDialogProps & {
     editData?: LineModificationDtoWithId;
+    /**
+     * When true, the dialog is displayed in read-only mode: all inputs
+     * (including those in nested sub-components) are disabled via a
+     * native <fieldset disabled>, so the form can only be viewed, not edited.
+     */
+    readOnly?: boolean;
 };
 
 /**
@@ -66,6 +72,7 @@ export type LineModificationDialogProps = EquipmentModificationDialogProps & {
  * @param dialogProps props that are forwarded to the generic ModificationDialog component
  * @param isUpdate check if edition form
  * @param editDataFetchStatus indicates the status of fetching EditData
+ * @param readOnly if true, disables every input (including nested sub-components) to display the form in view-only mode
  */
 const LineModificationDialog = ({
     editData,
@@ -75,6 +82,7 @@ const LineModificationDialog = ({
     currentRootNetworkUuid,
     isUpdate,
     editDataFetchStatus,
+    readOnly = true,
     ...dialogProps
 }: Readonly<LineModificationDialogProps>) => {
     const currentNodeUuid = currentNode?.id;
@@ -265,11 +273,13 @@ const LineModificationDialog = ({
             {...formMethods}
             isNodeBuilt={isNodeBuilt(currentNode)}
             isUpdate={isUpdate}
+            readOnly={readOnly}
         >
             <ModificationDialog
                 fullWidth
                 onClear={clear}
                 onSave={onSubmit}
+                readOnly={readOnly}
                 maxWidth={'xl'}
                 titleId="ModifyLine"
                 open={open}