diff --git a/tests/pr_test.go b/tests/pr_test.go
index 2868c47f..260fb03d 100644
--- a/tests/pr_test.go
+++ b/tests/pr_test.go
@@ -201,14 +201,11 @@ func TestFullyConfigurable(t *testing.T) {
 	require.True(t, present, checkVariable+" environment variable not set")
 	require.NotEqual(t, "", val, checkVariable+" environment variable is empty")
 
-	// Programmatically determine region to use based on availability
-	region, _ := testhelper.GetBestVpcRegion(val, "../common-dev-assets/common-go-assets/cloudinfo-region-vpc-gen2-prefs.yaml", "eu-de")
-
 	prefix := "vpc-da"
 
 	options := testschematic.TestSchematicOptionsDefault(&testschematic.TestSchematicOptions{
 		Testing: t,
-		Region:  region,
+		Region:  "eu-de",
 		Prefix:  prefix,
 		TarIncludePatterns: []string{
 			"*.tf",
@@ -248,6 +245,7 @@ func TestFullyConfigurableWithFlowLogs(t *testing.T) {
 
 	options := testschematic.TestSchematicOptionsDefault(&testschematic.TestSchematicOptions{
 		Testing: t,
+		Region:  "eu-de", // Hardcoding region to avoid jp-osa, as jp-osa does not support COS association with HPCS.
 		Prefix:  prefix,
 		TarIncludePatterns: []string{
 			"*.tf",
@@ -288,14 +286,11 @@ func TestRunUpgradeFullyConfigurable(t *testing.T) {
 	require.True(t, present, checkVariable+" environment variable not set")
 	require.NotEqual(t, "", val, checkVariable+" environment variable is empty")
 
-	// Programmatically determine region to use based on availability
-	region, _ := testhelper.GetBestVpcRegion(val, "../common-dev-assets/common-go-assets/cloudinfo-region-vpc-gen2-prefs.yaml", "eu-de")
-
 	prefix := "vpc-upg"
 
 	options := testschematic.TestSchematicOptionsDefault(&testschematic.TestSchematicOptions{
 		Testing: t,
-		Region:  region,
+		Region:  "eu-de", // Hardcoding region to avoid jp-osa, as jp-osa does not support COS association with HPCS.
 		Prefix:  prefix,
 		TarIncludePatterns: []string{
 			"*.tf",
diff --git a/variables.tf b/variables.tf
index 71d5eed9..ce79b4a4 100644
--- a/variables.tf
+++ b/variables.tf
@@ -13,8 +13,8 @@ variable "create_vpc" {
   }
 
   validation {
-    condition     = !(var.create_vpc == false && var.create_subnets == true)
-    error_message = "You cannot create subnets without creating a VPC. Hence if 'create_vpc' is false, then 'create_subnets' can not be true."
+    condition     = !(var.create_vpc == true && var.create_subnets == false)
+    error_message = "You must create subnets while creating a VPC. Hence if 'create_vpc' is true, then 'create_subnets' should be true."
   }
 }