diff --git a/frontend/src/views/tools/mmsMapping/components/MappingConfirmDialog.vue b/frontend/src/views/tools/mmsMapping/components/MappingConfirmDialog.vue
index 44a13e2..7345e1c 100644
--- a/frontend/src/views/tools/mmsMapping/components/MappingConfirmDialog.vue
+++ b/frontend/src/views/tools/mmsMapping/components/MappingConfirmDialog.vue
@@ -26,7 +26,7 @@
                 </div>
 
                 <div class="label-list">
-                    <article v-for="item in group.labelItems" :key="`${group.groupKey}-${item.label}`" class="label-card">
+                    <article v-for="item in group.labelItems" :key="item.itemKey" class="label-card">
                         <div class="label-main">
                             <div class="label-meta">
                                 <div class="label-title-row">
@@ -86,7 +86,7 @@
                         />
 
                         <div class="target-list">
-                            <div v-for="target in item.targets" :key="`${target.reportName}-${target.dataSetName}`" class="target-item">
+                            <div v-for="target in item.targets" :key="target.targetKey" class="target-item">
                                 <div class="target-name-row">
                                     <span class="target-name">{{ target.reportDesc || target.reportName || '--' }}</span>
                                     <span class="target-code">{{ target.reportName || '--' }} / {{ target.dataSetName || '--' }}</span>
@@ -135,6 +135,7 @@ defineOptions({
 })
 
 interface ConfirmDialogDraftTarget {
+    targetKey: string
     reportName: string
     dataSetName: string
     reportDesc: string
@@ -142,6 +143,7 @@ interface ConfirmDialogDraftTarget {
 }
 
 interface ConfirmDialogDraftLabelItem {
+    itemKey: string
     label: string
     required: boolean
     configurableOnce: boolean
@@ -158,9 +160,11 @@ interface ConfirmDialogDraftGroup {
 }
 
 interface PreparedConfirmDialogDraftLabelItem {
+    itemKey: string
     label: string
     required: boolean
     configurableOnce: boolean
+    defaultLnInst: string
     commonLnInstValues: string[]
     targets: ConfirmDialogDraftTarget[]
 }
@@ -222,15 +226,20 @@ const buildInitialDraftGroups = (groups: MmsMapping.IndexConfirmGroup[]): Confir
     groups
         .map(group => {
             const preparedItems = (group.labelItems || [])
-                .map<PreparedConfirmDialogDraftLabelItem | null>(item => {
+                .map<PreparedConfirmDialogDraftLabelItem | null>((item, itemIndex) => {
                     const commonLnInstValues = sortLnInstValues(normalizeStringArray(item.commonLnInstValues))
+                    const defaultLnInst = resolveDefaultLnInst(commonLnInstValues, item.defaultLnInst?.trim() || '')
+                    const itemKey = `${group.groupKey?.trim() || 'group'}-${itemIndex}-${item.label?.trim() || 'label'}`
 
                     return {
+                        itemKey,
                         label: item.label?.trim() || '',
                         required: Boolean(item.required),
                         configurableOnce: Boolean(item.configurableOnce),
+                        defaultLnInst,
                         commonLnInstValues,
-                        targets: (item.targets || []).map(target => ({
+                        targets: (item.targets || []).map((target, targetIndex) => ({
+                            targetKey: `${itemKey}-target-${targetIndex}-${target.reportName?.trim() || ''}-${target.dataSetName?.trim() || ''}`,
                             reportName: target.reportName?.trim() || '',
                             dataSetName: target.dataSetName?.trim() || '',
                             reportDesc: target.reportDesc?.trim() || '',
@@ -256,10 +265,10 @@ const buildInitialDraftGroups = (groups: MmsMapping.IndexConfirmGroup[]): Confir
 
                 cluster.forEach((item, index) => {
                     const expectedLnInst = index < clusterValues.length ? clusterValues[index] : ''
-                    const defaultLnInst = resolveDefaultLnInst(item.commonLnInstValues, expectedLnInst)
-                    const enabled = Boolean(defaultLnInst)
+                    const defaultLnInst = item.defaultLnInst || resolveDefaultLnInst(item.commonLnInstValues, expectedLnInst)
+                    const enabled = item.required || Boolean(defaultLnInst)
 
-                    defaultStateMap.set(item.label, {
+                    defaultStateMap.set(item.itemKey, {
                         enabled,
                         lnInst: defaultLnInst
                     })
@@ -270,12 +279,13 @@ const buildInitialDraftGroups = (groups: MmsMapping.IndexConfirmGroup[]): Confir
                 groupKey: group.groupKey?.trim() || '',
                 groupDesc: group.groupDesc?.trim() || '',
                 labelItems: preparedItems.map(item => {
-                    const defaultState = defaultStateMap.get(item.label) || {
-                        enabled: false,
+                    const defaultState = defaultStateMap.get(item.itemKey) || {
+                        enabled: item.required,
                         lnInst: ''
                     }
 
                     return {
+                        itemKey: item.itemKey,
                         label: item.label,
                         required: item.required,
                         configurableOnce: item.configurableOnce,
diff --git a/frontend/src/views/tools/mmsMapping/index.vue b/frontend/src/views/tools/mmsMapping/index.vue
index 4977f8e..998f533 100644
--- a/frontend/src/views/tools/mmsMapping/index.vue
+++ b/frontend/src/views/tools/mmsMapping/index.vue
@@ -111,6 +111,52 @@ const getErrorMessage = (error: unknown) => {
     return '接口调用失败，请检查后端服务和请求参数'
 }
 
+const logConfirmDataDiagnostics = (groups: MmsMapping.IndexConfirmGroup[]) => {
+    const interharmonicGroups = groups
+        .map(group => ({
+            groupKey: group.groupKey?.trim() || '',
+            groupDesc: group.groupDesc?.trim() || '',
+            labelItems: (group.labelItems || [])
+                .map(item => ({
+                    label: item.label?.trim() || '',
+                    defaultLnInst: item.defaultLnInst?.trim() || '',
+                    commonLnInstValues: item.commonLnInstValues || [],
+                    targets: (item.targets || []).map(target => ({
+                        reportName: target.reportName?.trim() || '',
+                        dataSetName: target.dataSetName?.trim() || '',
+                        availableLnInstValues: target.availableLnInstValues || []
+                    }))
+                }))
+                .filter(item =>
+                    [item.label, ...item.commonLnInstValues, ...item.targets.map(target => target.dataSetName)].some(value =>
+                        String(value || '').includes('间谐波')
+                    )
+                )
+        }))
+        .filter(group => group.labelItems.length)
+
+    // 关键业务节点：人工确认弹窗是否缺少某个 lnInst，首先取决于 build-index-confirm-data 的返回内容，这里保留诊断日志便于核对接口是否漏数。
+    console.info('[mmsMapping] build-index-confirm-data result', {
+        groupCount: groups.length,
+        interharmonicGroups
+    })
+
+    const missingFiveItems = interharmonicGroups.flatMap(group =>
+        group.labelItems
+            .filter(item => item.commonLnInstValues.length && !item.commonLnInstValues.includes('5'))
+            .map(item => ({
+                groupKey: group.groupKey,
+                label: item.label,
+                defaultLnInst: item.defaultLnInst,
+                commonLnInstValues: item.commonLnInstValues
+            }))
+    )
+
+    if (missingFiveItems.length) {
+        console.warn('[mmsMapping] interharmonic lnInst missing "5"', missingFiveItems)
+    }
+}
+
 const getFileExtension = (fileName: string) => fileName.split('.').pop()?.toLowerCase() || ''
 
 const isSupportedIcdFile = (fileName: string) => ['icd', 'cid', 'scd', 'xml'].includes(getFileExtension(fileName))
@@ -297,6 +343,7 @@ const handleParseIcd = async () => {
         const confirmGroups = unwrapApiPayload<MmsMapping.IndexConfirmGroup[]>(confirmResponse) || []
 
         confirmData.value = confirmGroups
+        logConfirmDataDiagnostics(confirmGroups)
 
         if (!confirmGroups.length) {
             indexSelectionJsonText.value = formatIndexSelectionJson([])