diff --git a/core/modules/migrate/config/schema/migrate.source.schema.yml b/core/modules/migrate/config/schema/migrate.source.schema.yml
index c7903cc..d9101a0 100644
--- a/core/modules/migrate/config/schema/migrate.source.schema.yml
+++ b/core/modules/migrate/config/schema/migrate.source.schema.yml
@@ -12,21 +12,5 @@ migrate.source.empty:
       type: string
       label: 'Provider'
     constants:
-      type: mapping
+      type: ignore
       label: 'Constants'
-      mapping:
-        entity_type:
-          type: string
-          label: 'Entity type'
-        type:
-          type: string
-          label: 'Type'
-        name:
-          type: string
-          label: 'Name'
-        cardinality:
-          type: integer
-          label: 'Cardinality'
-        display_field:
-          type: boolean
-          label: 'Display field'
diff --git a/core/modules/migrate_drupal/config/install/migrate.migration.d6_block_content_body_field.yml b/core/modules/migrate_drupal/config/install/migrate.migration.d6_block_content_body_field.yml
index 5f604d6..c079619 100644
--- a/core/modules/migrate_drupal/config/install/migrate.migration.d6_block_content_body_field.yml
+++ b/core/modules/migrate_drupal/config/install/migrate.migration.d6_block_content_body_field.yml
@@ -9,13 +9,13 @@ source:
   constants:
     entity_type: block_content
     bundle: basic
-    field_name: body
+    name: body
     label: Body
     display_summary: false
 process:
   entity_type: 'constants/entity_type'
   bundle: 'constants/bundle'
-  field_name: 'constants/field_name'
+  field_name: 'constants/name'
   label: 'constants/label'
   'settings/display_summary': 'constants/display_summary'
 destination:
diff --git a/core/modules/migrate_drupal/config/install/migrate.migration.d6_block_content_type.yml b/core/modules/migrate_drupal/config/install/migrate.migration.d6_block_content_type.yml
index 6a439b4..8b3f607 100644
--- a/core/modules/migrate_drupal/config/install/migrate.migration.d6_block_content_type.yml
+++ b/core/modules/migrate_drupal/config/install/migrate.migration.d6_block_content_type.yml
@@ -7,14 +7,10 @@ source:
   # migration_dependencies.
   plugin: empty
   constants:
-    label: Basic
     id: basic
-    revision: false
-    description: ''
+    label: Basic
 process:
   id: 'constants/id'
   label: 'constants/label'
-  revision: 'constants/revision'
-  description: 'constants/description'
 destination:
   plugin: entity:block_content_type
\ No newline at end of file