add bcp414

Author: mumian

articles/azure-resource-manager/bicep/diagnostics/bcp414.md

@@ -0,0 +1,69 @@
+---
+title: BCP414
+description: The spread operator "..." is not permitted in this location.
+ms.topic: reference
+ms.custom: devx-track-bicep
+ms.date: 05/20/2025
+---
+
+# Bicep diagnostic code - BCP414
+
+This diagnostic occurs when you use expressions to define resource bodies as the [`Spread`](../operator-spread.md) operator gets converted to a function. It's a limitation in JSON.
+
+## Description
+
+The spread operator "..." is not permitted in this location.
+
+## Level
+
+Error
+
+## Examples
+
+The following example raises the diagnostic because the `spread` operator is used to define the resource body:
+
+```bicep
+param location string = resourceGroup().location
+param addressPrefix string = '10.0.0.0/24'
+ 
+resource vnet 'Microsoft.Network/virtualNetworks@2024-01-01' = {
+  name: 'vnetName'
+  location: location
+ 
+  ...(addressPrefix != '' ? {
+    properties: {
+      addressSpace: {
+        addressPrefixes: [
+          addressPrefix
+        ]
+      }
+    }
+  } : {})
+}
+```
+
+You can fix the diagnostic by using the operator in the lower level:
+
+```bicep
+param location string = resourceGroup().location
+param addressPrefix string = '10.0.0.0/24'
+ 
+resource vnet 'Microsoft.Network/virtualNetworks@2024-01-01' = {
+  name: 'vnetName'
+  location: location
+ 
+  properties: {
+    addressSpace: {
+      ...(addressPrefix != '' ? {
+        addressPrefixes: [
+          addressPrefix
+        ]        
+      } : {})
+    }
+  }
+}
+```
+
+## Next steps
+
+For more information about Bicep diagnostics, see [Bicep core diagnostics](../bicep-core-diagnostics.md).