diff --git a/mmv1/third_party/terraform/fwprovider/framework_provider.go.tmpl b/mmv1/third_party/terraform/fwprovider/framework_provider.go.tmpl
index c2f79d10de53..0ccbe21f9a17 100644
--- a/mmv1/third_party/terraform/fwprovider/framework_provider.go.tmpl
+++ b/mmv1/third_party/terraform/fwprovider/framework_provider.go.tmpl
@@ -5,6 +5,7 @@ import (
 
     sdk_schema "github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema"
 
+    "github.com/hashicorp/terraform-plugin-framework-validators/listvalidator"
     "github.com/hashicorp/terraform-plugin-framework-validators/stringvalidator"
     "github.com/hashicorp/terraform-plugin-framework/datasource"
     "github.com/hashicorp/terraform-plugin-framework/ephemeral"
@@ -230,6 +231,9 @@ func (p *FrameworkProvider) Schema(_ context.Context, _ provider.SchemaRequest,
         },
         Blocks: map[string]schema.Block{
             "batching": schema.ListNestedBlock{
+                Validators: []validator.List{
+                    listvalidator.SizeAtMost(1),
+                },
                 NestedObject: schema.NestedBlockObject{
                     Attributes: map[string]schema.Attribute{
                         "send_after": schema.StringAttribute{
@@ -245,6 +249,9 @@ func (p *FrameworkProvider) Schema(_ context.Context, _ provider.SchemaRequest,
                 },
             },
             "external_credentials": schema.ListNestedBlock{
+                Validators: []validator.List{
+                    listvalidator.SizeAtMost(1),
+                },
                 NestedObject: schema.NestedBlockObject{
                     Attributes: map[string]schema.Attribute{
                         "audience": schema.StringAttribute{