diff --git a/ui/src/pages/ProductionProductCostingHasCostDetail.vue b/ui/src/pages/ProductionProductCostingHasCostDetail.vue
index 207a3d1..d32db54 100644
--- a/ui/src/pages/ProductionProductCostingHasCostDetail.vue
+++ b/ui/src/pages/ProductionProductCostingHasCostDetail.vue
@@ -3936,12 +3936,24 @@ async function fetchRequiredParcaMappings () {
 
   const data = await fetchMappings(ilk)
   const mappings = Array.isArray(data) ? data : []
-  if (mappings.length > 0 || !isMalzemesizFasonProduct()) return mappings
+  if (!isMalzemesizFasonProduct()) return mappings
 
-  // MALZEMESIZ FASON uses the same required-part definition as its
-  // MALZEMELI FASON counterpart for the same product main/sub group.
-  const fallback = await fetchMappings('MALZEMELI FASON')
-  return Array.isArray(fallback) ? fallback : []
+  // MALZEMESIZ FASON inherits required parts from MALZEMELI FASON at
+  // Urun Ana Grubu level. Do not require an exact alt-group match: the
+  // business rule is defined by the main group, and a partial MALZEMESIZ
+  // mapping must not prevent the inherited missing parts from appearing.
+  const inheritedData = await get('/pricing/production-product-costing/maliyet-parca-eslestirme', {
+    trace_id: traceId.value,
+    only_active: 1,
+    urun_ilk_grubu: 'MALZEMELI FASON',
+    urun_ana_grubu: ana,
+    urun_alt_grubu: ''
+  })
+  const inheritedMappings = Array.isArray(inheritedData) ? inheritedData : []
+
+  // Keep both sources. ensureNoCostRequiredRowsFromMappings de-duplicates
+  // required rows by MT section + raw-material type.
+  return [...mappings, ...inheritedMappings]
 }
 
 async function resolveHammaddeMetaForRequired (hNo) {