fix region

Author: mahesh0431

released/discovery_center/mission_3680/step1/variables.tf

@@ -38,14 +38,7 @@ variable "subaccount_service_admins" {
 variable "region" {
   type        = string
   description = "The region where the sub account shall be created in."
-  default     = "us10"
-
-  # Checkout https://github.com/SAP-samples/btp-service-metadata/blob/main/v0/developer/aicore.json for the latest list of regions
-  # supported by the AI Core service with the "extended" service plan.
-  validation {
-    condition     = contains(["ap10", "eu10", "eu11", "eu20", "eu30", "jp10", "us10", "us21", "us30"], var.region)
-    error_message = "Please enter a valid region for the sub account. Checkout https://github.com/SAP-samples/btp-service-metadata/blob/main/v0/developer/aicore.json for regions providing the AI Core service."
-  }
+  default     = ""
 }