diff --git a/server/freeproService.ts b/server/freeproService.ts
index 9de73b1..421175f 100644
--- a/server/freeproService.ts
+++ b/server/freeproService.ts
@@ -129,23 +129,25 @@ export function processFreeproExcel(
 
     const description = String(row.description || "");
     const labelClient = String(row.label_client || "");
-    const structure = row.structure ? String(row.structure) : null;
+    // Les lignes sans structure sont affectées à 3069UDA par convention
+    const structureRaw = row.structure ? String(row.structure).trim() : "";
+    const structure = structureRaw !== "" ? structureRaw : "3069UDA";
     const totalHt = parseFloat(String(row.total || "0").replace(",", ".")) || 0;
 
     const script = getScript(description);
     const ttc = getTtc(totalHt);
     const type = getType(labelClient, script);
 
-    const key = `${structure ?? ""}|||${type}`;
+    const key = `${structure}|||${type}`;
     aggregation.set(key, (aggregation.get(key) || 0) + Math.round(ttc * 100));
   }
 
   // Construire les lignes de résultat
   const lines: FreeproVentilationResult["lines"] = [];
   for (const [key, centimes] of Array.from(aggregation.entries())) {
-    const [structureRaw, type] = key.split("|||");
+    const [structureVal, type] = key.split("|||");
     lines.push({
-      structure: structureRaw === "" ? null : structureRaw,
+      structure: structureVal || null,
       type,
       montant: centimes / 100,
     });