Fix broadband plan change update

app/Models/Service.php

@@ -35,6 +35,7 @@ use App\Traits\SiteID;
  * + billed_to					: When this service has been billed to	// @todo rename all references to invoice_to
  * + category					: The type of service this is, eg: broadband, phone
  * + category_name				: The type of service this is, eg: Broadband, Telephone (in human friendly)
+ * + isChargedOverride			: Has the price been overridden?
  * + contract_term				: The term that this service must be active
  * + contract_end				: The date that the contract ends for this service
  * + name                       : Service short name with service address
@@ -1216,6 +1217,11 @@ class Service extends Model implements IDs
 			AND ! in_array($this->order_status,array_merge(self::INACTIVE_STATUS,['INACTIVE']));
 	}
 
+	public function isChargeOverriden(): bool
+	{
+		return (! is_null($this->price)) || (! is_null($this->price_override));
+	}
+
 	/**
 	 * Generate a collection of invoice_item objects that will be billed for the next invoice
 	 *