diff --git a/services/dataProcessor.ts b/services/dataProcessor.ts
index e29f3ab..159d2a1 100644
--- a/services/dataProcessor.ts
+++ b/services/dataProcessor.ts
@@ -2260,14 +2260,16 @@ export const processBuyBoxExcel = async (fileOrBuffer: File | ArrayBuffer): Prom
                 });
             }
 
-            // Fallback to previous hardcoded indices if header search fails
-            if (reasonIdx === -1) {
-                if (config.country === 'FR') reasonIdx = 18;
-                else if (config.country === 'UK') reasonIdx = 9;
-                else if (config.country === 'DE') reasonIdx = 13;
-                else if (config.country === 'IT') reasonIdx = 12;
-                else if (config.country === 'ES') reasonIdx = 13;
-                else reasonIdx = 13;
+            // Fallback to previous hardcoded indices if header search fails or for specific known sheet structures
+            if (reasonIdx === -1 || (config.country === 'FR' && reasonIdx !== 18)) {
+                if (config.country === 'FR') reasonIdx = 18; // Force Column S for FR
+                else if (reasonIdx === -1) {
+                    if (config.country === 'UK') reasonIdx = 9;
+                    else if (config.country === 'DE') reasonIdx = 13;
+                    else if (config.country === 'IT') reasonIdx = 12;
+                    else if (config.country === 'ES') reasonIdx = 13;
+                    else reasonIdx = 13;
+                }
             }
 
             console.log(`[BuyBox] Sheet "${sheetName}" (Country: ${config.country}): HeaderRow=${headerRowIdx}, ASIN Col=${finalAsinIdx} ("${headers[finalAsinIdx]}"), Reason Col=${reasonIdx} ("${headers[reasonIdx] || 'N/A'}")`);