diff --git a/client/src/pages/InvoicesBAP.tsx b/client/src/pages/InvoicesBAP.tsx
index ffb8c54..24d350a 100644
--- a/client/src/pages/InvoicesBAP.tsx
+++ b/client/src/pages/InvoicesBAP.tsx
@@ -284,6 +284,17 @@ export default function InvoicesBAP() {
     },
   });
 
+  const devalidateBAPMutation = trpc.invoices.devalidateBAP.useMutation({
+    onSuccess: (data) => {
+      toast.success(`${data.processed} facture(s) dévalidée(s) BAP avec succès`);
+      setSelectedIds([]);
+      utils.invoices.list.invalidate();
+    },
+    onError: (error) => {
+      toast.error(error.message || "Erreur lors de la dévalidation BAP");
+    },
+  });
+
   const updateFieldMutation = trpc.invoices.update.useMutation({
     onSuccess: () => {
       toast.success("Facture mise à jour");
@@ -556,8 +567,10 @@ export default function InvoicesBAP() {
           <h1 className="text-3xl font-bold">Factures BAP</h1>
           <p className="text-gray-500 mt-1">Factures non-abonnement (Abonnement = NON)</p>
         </div>
-        {/* Barre d'actions : boutons sur une ligne dédiée avec retour à la ligne automatique */}
-        <div className="flex flex-wrap gap-2">
+        {/* Barre d'actions : 2 lignes */}
+        <div className="space-y-2">
+          {/* Ligne 1 : Excel, ZIP, Valider tout en BAP, Importer */}
+          <div className="flex flex-wrap gap-2">
             <Button
               onClick={handleExportExcel}
               disabled={selectedIds.length === 0 || exportExcelMutation.isPending}
@@ -567,17 +580,8 @@ export default function InvoicesBAP() {
               <FileSpreadsheet className="w-4 h-4 mr-2" />
               Excel ({selectedIds.length})
             </Button>
-            <Button
-              onClick={handleExport}
-              disabled={selectedIds.length === 0 || exportMutation.isPending}
-              className="bg-blue-600 hover:bg-blue-700"
-            >
-              <Download className="w-4 h-4 mr-2" />
-              Exporter ({selectedIds.length})
-            </Button>
             <Button
               onClick={async () => {
-                // Construire la liste des PDFs validés parmi la sélection
                 const files = selectedIds
                   .map(id => {
                     const inv = invoices?.find(i => i.id === id);
@@ -612,6 +616,25 @@ export default function InvoicesBAP() {
               <FolderDown className={`w-4 h-4 mr-2 ${isZipDownloading ? 'animate-bounce' : ''}`} />
               {isZipDownloading ? 'ZIP...' : `ZIP (${selectedIds.length})`}
             </Button>
+            <Button
+              onClick={() => {
+                if (confirm("Valider en BAP toutes les factures éligibles (score 100%, champs remplis, non abonnement) ? Les PDFs annotés seront générés automatiquement.")) {
+                  validateBAPBulkMutation.mutate();
+                }
+              }}
+              disabled={validateBAPBulkMutation.isPending}
+              className="bg-green-700 hover:bg-green-800 text-white"
+            >
+              <ShieldCheck className="w-4 h-4 mr-2" />
+              {validateBAPBulkMutation.isPending ? "Validation en cours..." : "Valider tout en BAP"}
+            </Button>
+            <Button onClick={() => setLocation("/upload")}>
+              <FileText className="w-4 h-4 mr-2" />
+              Importer
+            </Button>
+          </div>
+          {/* Ligne 2 : Supprimer, Dévalider BAP, Relancer */}
+          <div className="flex flex-wrap gap-2">
             <Button
               onClick={async () => {
                 if (confirm(`Voulez-vous vraiment supprimer ${selectedIds.length} facture(s) ?`)) {
@@ -635,15 +658,21 @@ export default function InvoicesBAP() {
             </Button>
             <Button
               onClick={() => {
-                if (confirm("Valider en BAP toutes les factures éligibles (score 100%, champs remplis, non abonnement) ? Les PDFs annotés seront générés automatiquement.")) {
-                  validateBAPBulkMutation.mutate();
+                const bapIds = selectedIds.filter(id => invoices?.find(inv => inv.id === id)?.bapValidated === 1);
+                if (bapIds.length === 0) {
+                  toast.error("Aucune facture BAP validée parmi la sélection");
+                  return;
+                }
+                if (confirm(`Dévalider ${bapIds.length} facture(s) BAP ? Elles repasser ont en statut à traiter.`)) {
+                  devalidateBAPMutation.mutate({ invoiceIds: bapIds });
                 }
               }}
-              disabled={validateBAPBulkMutation.isPending}
-              className="bg-green-700 hover:bg-green-800 text-white"
+              disabled={selectedIds.length === 0 || devalidateBAPMutation.isPending}
+              variant="outline"
+              className="border-orange-500 text-orange-600 hover:bg-orange-50"
             >
-              <ShieldCheck className="w-4 h-4 mr-2" />
-              {validateBAPBulkMutation.isPending ? "Validation en cours..." : "Valider tout en BAP"}
+              <ShieldCheck className="w-4 h-4 mr-2 rotate-180" />
+              {devalidateBAPMutation.isPending ? "Dévalidation..." : `Dévalider BAP (${selectedIds.length})`}
             </Button>
             <Button
               onClick={() => {
@@ -662,10 +691,7 @@ export default function InvoicesBAP() {
               <RefreshCw className={`w-4 h-4 mr-2 ${reprocessMutation.isPending ? 'animate-spin' : ''}`} />
               {reprocessMutation.isPending ? `Retraitement...` : `Relancer (${selectedIds.length})`}
             </Button>
-            <Button onClick={() => setLocation("/upload")}>
-              <FileText className="w-4 h-4 mr-2" />
-              Importer
-            </Button>
+          </div>
         </div>
 
         <Card>
diff --git a/server/routers.ts b/server/routers.ts
index cf59dbe..172ec32 100644
--- a/server/routers.ts
+++ b/server/routers.ts
@@ -654,6 +654,24 @@ export const appRouter = router({
         };
       }),
 
+    // ── Dévalidation BAP ──────────────────────────────────────
+    devalidateBAP: protectedProcedure
+      .input(z.object({ invoiceIds: z.array(z.number()) }))
+      .mutation(async ({ input, ctx }) => {
+        let processed = 0;
+        for (const id of input.invoiceIds) {
+          const invoice = await getInvoiceById(id);
+          if (!invoice || invoice.userId !== ctx.user.id) continue;
+          await updateInvoice(id, {
+            bapValidated: 0,
+            bapValidatedAt: null,
+            exportStatus: "not_exported",
+          });
+          processed++;
+        }
+        return { success: true, processed };
+      }),
+
     // ── Validation BAP en masse ──────────────────────────────
     validateBAPBulk: protectedProcedure
       .mutation(async ({ ctx }) => {