diff --git a/.vscode/launch.json b/.vscode/launch.json
index b77f3b95..fcc80a75 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -53,7 +53,7 @@
         "AYANOVA_FOLDER_USER_FILES": "c:\\temp\\RavenTestData\\userfiles",
         "AYANOVA_FOLDER_BACKUP_FILES": "c:\\temp\\RavenTestData\\backupfiles",
         "AYANOVA_FOLDER_TEMPORARY_SERVER_FILES": "c:\\temp\\RavenTestData\\tempfiles",
-        "AYANOVA_SERVER_TEST_MODE": "false",
+        "AYANOVA_SERVER_TEST_MODE": "true",
         "AYANOVA_SERVER_TEST_MODE_SEEDLEVEL": "small",
         "AYANOVA_SERVER_TEST_MODE_TZ_OFFSET": "-7",
         "AYANOVA_BACKUP_PG_DUMP_PATH": "C:\\data\\code\\postgres_13\\bin\\"
diff --git a/server/AyaNova/biz/PartInventoryBiz.cs b/server/AyaNova/biz/PartInventoryBiz.cs
index 5a1c33f6..b2189a08 100644
--- a/server/AyaNova/biz/PartInventoryBiz.cs
+++ b/server/AyaNova/biz/PartInventoryBiz.cs
@@ -233,11 +233,18 @@ namespace AyaNova.Biz
             //values must add up
             if (proposedObj.Balance != (proposedObj.Quantity + (proposedObj.LastBalance ?? 0)))
             {
-                AddError(ApiErrorCode.VALIDATION_INVALID_VALUE, "Balance", "Balance incorrect (LastBalance + Quantity not equal to Balance");
+                AddError(ApiErrorCode.VALIDATION_INVALID_VALUE, "Balance", "Balance incorrect (LastBalance + Quantity not equal to Balance)");
                 return;
             }
 
+              //Balance must not be negative
+            if (proposedObj.Balance < 0 )
+            {
+                AddError(ApiErrorCode.VALIDATION_INVALID_VALUE, "Balance", "Transaction would result in a negative balance (not enough inventory to process this transaction)");
+                return;
+            }
 
+          
             //date is newer than last entry date?
             if (proposedObj.LastEntryDate != null && proposedObj.LastEntryDate > proposedObj.EntryDate)
             {
diff --git a/server/AyaNova/biz/PurchaseOrderBiz.cs b/server/AyaNova/biz/PurchaseOrderBiz.cs
index ca05b267..a07b789d 100644
--- a/server/AyaNova/biz/PurchaseOrderBiz.cs
+++ b/server/AyaNova/biz/PurchaseOrderBiz.cs
@@ -416,7 +416,7 @@ namespace AyaNova.Biz
                     dtInternalPartInventory i = new dtInternalPartInventory();
                     i.PartId = poItem.PartId;
                     i.PartWarehouseId = poItem.PartWarehouseId;
-                    i.Quantity = poItem.QuantityReceived *= -1;
+                    i.Quantity = poItem.QuantityReceived * -1;
                     i.SourceType = null;//null because the po no longer exists so this is technically a manual adjustment
                     i.SourceId = null;//''
                     i.Description = await Translate("PurchaseOrder") + $" {oldObj.Serial} " + await Translate("EventDeleted");
@@ -488,7 +488,7 @@ namespace AyaNova.Biz
                             dtInternalPartInventory i = new dtInternalPartInventory();
                             i.PartId = oldItem.PartId;
                             i.PartWarehouseId = oldItem.PartWarehouseId;
-                            i.Quantity = oldItem.QuantityReceived *= -1;
+                            i.Quantity = oldItem.QuantityReceived * -1;
                             i.SourceType = AyaType.PurchaseOrder;
                             i.SourceId = oldObj.Id;
                             i.Description = await Translate("PurchaseOrder") + $" {oldObj.Serial} " + await Translate("PurchaseOrderItem") + " " + await Translate("EventDeleted");
@@ -553,7 +553,7 @@ namespace AyaNova.Biz
                             dtInternalPartInventory i = new dtInternalPartInventory();
                             i.PartId = oldItem.PartId;
                             i.PartWarehouseId = oldItem.PartWarehouseId;
-                            i.Quantity = oldItem.QuantityReceived *= -1;
+                            i.Quantity = oldItem.QuantityReceived * -1;
                             i.SourceType = AyaType.PurchaseOrder;
                             i.SourceId = oldObj.Id;
                             i.Description = await Translate("PurchaseOrder") + $" {oldObj.Serial} " + await Translate("PurchaseOrderItem") + " " + await Translate("EventModified") + " " + await Translate("Part") + "/" + await Translate("PartWarehouse");
diff --git a/server/AyaNova/biz/WorkOrderBiz.cs b/server/AyaNova/biz/WorkOrderBiz.cs
index 15cb644e..b43e61c0 100644
--- a/server/AyaNova/biz/WorkOrderBiz.cs
+++ b/server/AyaNova/biz/WorkOrderBiz.cs
@@ -3342,7 +3342,7 @@ namespace AyaNova.Biz
                       {
                           PartId = oldObj.PartId,
                           PartWarehouseId = oldObj.PartWarehouseId,
-                          Quantity = oldObj.Quantity *= -1,
+                          Quantity = oldObj.Quantity,
                           SourceType = null,//null because the po no longer exists so this is technically a manual adjustment
                           SourceId = null,//''
                           Description = await Translate("WorkOrderItemPart") + $" {oldObj.Serials} " + await Translate("EventDeleted")
@@ -3368,7 +3368,7 @@ namespace AyaNova.Biz
                       {
                           PartId = newObj.PartId,
                           PartWarehouseId = newObj.PartWarehouseId,
-                          Quantity = newObj.Quantity,
+                          Quantity = newObj.Quantity * -1,
                           SourceType = AyaType.WorkOrderItemPart,
                           SourceId = newObj.Id,
                           Description = await Translate("WorkOrderItemPart") + $" {newObj.Serials} " + await Translate("EventCreated")
@@ -3397,7 +3397,7 @@ namespace AyaNova.Biz
                         {
                             PartId = oldObj.PartId,
                             PartWarehouseId = oldObj.PartWarehouseId,
-                            Quantity = oldObj.Quantity *= -1,
+                            Quantity = oldObj.Quantity,
                             SourceType = null,//null because the po no longer exists so this is technically a manual adjustment
                             SourceId = null,//''
                             Description = await Translate("WorkOrderItemPart") + $" {oldObj.Serials} " + await Translate("EventDeleted")
@@ -3418,7 +3418,7 @@ namespace AyaNova.Biz
                         {
                             PartId = newObj.PartId,
                             PartWarehouseId = newObj.PartWarehouseId,
-                            Quantity = newObj.Quantity,
+                            Quantity = newObj.Quantity * -1,
                             SourceType = AyaType.WorkOrderItemPart,
                             SourceId = newObj.Id,
                             Description = await Translate("WorkOrderItemPart") + $" {newObj.Serials} " + await Translate("EventCreated")