src/Elfisa.Avalonia/ViewModels/OrdersViewModel.cs

@@ -134,6 +134,7 @@ public partial class OrdersViewModel : ViewModelBase
             Busy = true;
             var req = new BuyerOrderCreateRequest
             {
+                GlobalSign = d.Number.StartsWith("EX-", StringComparison.OrdinalIgnoreCase) ? d.Number : null,
                 LocationId = d.LocationId,
                 Comment = d.Comment,
                 Items = d.Items.Select(i => new BuyerOrderItemReq

src/Elfisa.Avalonia/ViewModels/PriceListViewModel.cs

@@ -88,28 +88,37 @@ public partial class PriceListViewModel : ViewModelBase
     private void RemoveFromCart(CartItem? item) => _cart.Remove(item!);
 
     [RelayCommand]
-    private void SaveDraft()
+    private async Task SaveDraftAsync()
     {
         if (_cart.Count == 0) { Status = "Заказ пуст — добавьте позиции."; return; }
-
-        var draft = new DraftOrder
+        try
         {
-            LocationId = SelectedLocation?.BuyerLocationId,
-            LocationAddress = SelectedLocation?.Address,
-            Comment = string.IsNullOrWhiteSpace(Comment) ? null : Comment.Trim(),
-            Items = _cart.Items.Select(c => new DraftItem
+            Busy = true;
+            // Резервируем настоящий номер заказа EX-####### (как в WinForms)
+            var sign = await _api.NextGlobalSignAsync();
+
+            var draft = new DraftOrder
             {
-                SupplierPriceId = c.Source.SupplierPriceId ?? "",
-                Name = c.Name,
-                Supplier = c.Supplier,
-                Barcode = c.Source.Barcode,
-                Price = c.Price,
-                Qty = c.Qty
-            }).ToList()
-        };
-        var saved = DraftStore.Add(draft);
-        _cart.Clear();
-        Comment = "";
-        Status = $"Заказ сохранён как черновик {saved.Number} → раздел «Заказы» (не отправлен).";
+                Number = string.IsNullOrWhiteSpace(sign) ? $"ЧРН-{DateTime.Now:HHmmss}" : sign!,
+                LocationId = SelectedLocation?.BuyerLocationId,
+                LocationAddress = SelectedLocation?.Address,
+                Comment = string.IsNullOrWhiteSpace(Comment) ? null : Comment.Trim(),
+                Items = _cart.Items.Select(c => new DraftItem
+                {
+                    SupplierPriceId = c.Source.SupplierPriceId ?? "",
+                    Name = c.Name,
+                    Supplier = c.Supplier,
+                    Barcode = c.Source.Barcode,
+                    Price = c.Price,
+                    Qty = c.Qty
+                }).ToList()
+            };
+            DraftStore.Add(draft);
+            _cart.Clear();
+            Comment = "";
+            Status = $"Заказ сохранён: {draft.Number} → раздел «Заказы» (не отправлен).";
+        }
+        catch (Exception ex) { Status = "Ошибка сохранения: " + ex.Message; }
+        finally { Busy = false; }
     }
 }

src/Elfisa.Core/ApiClient.cs

@@ -129,6 +129,19 @@ public sealed class ApiClient
         return JsonSerializer.Deserialize<BuyerOrderResponse>(text, Json) ?? new BuyerOrderResponse();
     }
 
+    /// <summary>Резервирует следующий номер заказа EX-####### (как в WinForms до создания заказа).</summary>
+    public async Task<string?> NextGlobalSignAsync()
+    {
+        EnsureAuth();
+        var text = await AuthorizedGetAsync("/api/buyer/global-sign/next", "резервирование номера").ConfigureAwait(false);
+        try
+        {
+            using var doc = JsonDocument.Parse(text);
+            return doc.RootElement.TryGetProperty("global_sign", out var v) ? v.GetString() : null;
+        }
+        catch { return null; }
+    }
+
     /// <summary>Адреса-грузополучатели покупателя.</summary>
     public async Task<List<BuyerLocationDto>> GetBuyerLocationsAsync()
     {

src/Elfisa.Core/DraftStore.cs

@@ -29,7 +29,7 @@ public sealed class DraftOrder
 /// <summary>Локальные черновики заказов (%APPDATA%\ElfisaAvalonia\drafts.json).</summary>
 public static class DraftStore
 {
-    private sealed class Box { public int Seq { get; set; } public List<DraftOrder> Drafts { get; set; } = new(); }
+    private sealed class Box { public List<DraftOrder> Drafts { get; set; } = new(); }
 
     private static readonly string Dir =
         Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "ElfisaAvalonia");
@@ -62,8 +62,6 @@ public static class DraftStore
 
     public static DraftOrder Add(DraftOrder draft)
     {
-        _box.Seq++;
-        draft.Number = $"ЧРН-{_box.Seq:0000}";
         _box.Drafts.Insert(0, draft);
         Save();
         return draft;

src/Elfisa.Core/Dtos.cs

@@ -94,6 +94,7 @@ public sealed class BuyerOrderCreateRequest
 {
     [JsonPropertyName("location_id")] public string? LocationId { get; set; }
     [JsonPropertyName("comment")] public string? Comment { get; set; }
+    [JsonPropertyName("global_sign")] public string? GlobalSign { get; set; }
     [JsonPropertyName("items")] public List<BuyerOrderItemReq> Items { get; set; } = new();
 }