diff --git a/data/1.0.0-preview-1/schema/manifest.schema.json b/data/1.0.0-preview-1/schema/manifest.schema.json
index 9de2cf01..bb87c873 100644
--- a/data/1.0.0-preview-1/schema/manifest.schema.json
+++ b/data/1.0.0-preview-1/schema/manifest.schema.json
@@ -149,7 +149,7 @@
       "type": "array",
       "items": {
         "title": "Geopolitical Unit",
-        "type": ["object", "null"],
+        "type": "object",
         "properties": {
           "object_id": {
             "title": "Id",
@@ -260,7 +260,7 @@
       "type": "array",
       "items": {
         "title": "Party",
-        "type": ["object", "null"],
+        "type": "object",
         "properties": {
           "object_id": {
             "title": "Id",
@@ -311,7 +311,7 @@
       "type": "array",
       "items": {
         "title": "Candidate",
-        "type": ["object", "null"],
+        "type": "object",
         "properties": {
           "object_id": {
             "title": "Id",
@@ -364,7 +364,7 @@
       "type": "array",
       "items": {
         "title": "Contest",
-        "type": ["object", "null"],
+        "type": "object",
         "properties": {
           "object_id": {
             "title": "Id",
@@ -495,7 +495,7 @@
       "type": "array",
       "items": {
         "title": "Ballot Style",
-        "type": ["object", "null"],
+        "type": "object",
         "properties": {
           "object_id": {
             "title": "Id",
diff --git a/data/1.0.0-preview-1/schema/plaintext_ballot.schema.json b/data/1.0.0-preview-1/schema/plaintext_ballot.schema.json
index 63546380..7be519fb 100644
--- a/data/1.0.0-preview-1/schema/plaintext_ballot.schema.json
+++ b/data/1.0.0-preview-1/schema/plaintext_ballot.schema.json
@@ -15,7 +15,7 @@
     "PlaintextBallotSelection": {
       "title": "Plaintext Ballot Selection",
       "type": "object",
-      "required": ["object_id", "vote", "sequence_order"],
+      "required": ["object_id", "vote"],
       "properties": {
         "object_id": {
           "title": "Object Id",
@@ -39,7 +39,7 @@
     "PlaintextBallotContest": {
       "title": "Plaintext Ballot Contest",
       "type": "object",
-      "required": ["object_id", "sequence_order", "ballot_selections"],
+      "required": ["object_id", "ballot_selections"],
       "properties": {
         "object_id": {
           "title": "Object Id",