diff --git a/terraform/main.tf b/terraform/main.tf
index 7eac081..c337a79 100644
--- a/terraform/main.tf
+++ b/terraform/main.tf
@@ -40,12 +40,12 @@ module "vm-n8n" {
 
 module "inventory" {
   source   = "./modules/proxmox_ansible_inventory"
-  filename = "${abspath("${path.root}/..")}/ansible/inventory/inventory.yml"
+  filename = "${path.root}/ansible/inventory/inventory.yml"
   instances = local.vm_created
 }
 
 module "vm_data" {
   source    = "./modules/proxmox_vm_data"
-  filename  = "${abspath("${path.root}/..")}/terraform/vm_data.yml"
+  filename  = "${path.root}/terraform/vm_data.yml"
   instances = local.vm_created
 }
diff --git a/terraform/variables.tf b/terraform/variables.tf
index 1cb6ece..7555c66 100644
--- a/terraform/variables.tf
+++ b/terraform/variables.tf
@@ -1,40 +1,44 @@
 variable "instance_mode" {
-  type    = string
-  default = "single"
+  type        = string
+  description = "single or multiple"
+
+  validation {
+    condition     = contains(["single", "multiple"], var.instance_mode)
+    error_message = "instance_mode must be either single or multiple."
+  }
 }
 
 variable "instance" {
-  description = "Single instance definition"
   type = object({
-    service_name   = string
-    vm_name        = string
-    node_name      = string
-    vm_cpu         = optional(number)
-    vm_ram         = optional(number)
-    vm_size        = optional(string)
-    app_port       = number
-    app_image      = string
-    vm_tags        = optional(list(string))
+    service_name = string
+    vm_name      = string
+    node_name    = string
+    vm_cpu       = optional(number)
+    vm_ram       = optional(number)
+    vm_size      = optional(string)
+    vm_tags      = optional(list(string))
   })
-  default = null
+  default   = null
+  nullable  = true
+  description = "Used only when instance_mode = single."
 }
 
 variable "instances" {
-  description = "Multiple instance definitions"
   type = map(object({
-    service_name   = string
-    vm_name        = string
-    node_name      = string
-    vm_cpu         = optional(number)
-    vm_ram         = optional(number)
-    vm_size        = optional(string)
-    app_port       = number
-    app_image      = string
-    vm_tags        = optional(list(string))
+    service_name = string
+    vm_name      = string
+    node_name    = string
+    vm_cpu       = optional(number)
+    vm_ram       = optional(number)
+    vm_size      = optional(string)
+    vm_tags      = optional(list(string))
   }))
-  default = {}
+  default     = {}
+  nullable    = false
+  description = "Used only when instance_mode = multiple."
 }
 
+
 variable "vm_defaults" {
   type = object({
     node_datastore = string