diff --git a/lineage.cue b/lineage.cue
index 44bd4782..3fc48b68 100644
--- a/lineage.cue
+++ b/lineage.cue
@@ -27,7 +27,8 @@ import (
 	//
 	// A lineage's joinSchema must never change as the lineage evolves.
 
-	joinSchema?: struct.MinFields(1)
+	//	joinSchema?: struct.MinFields(1)
+	joinSchema: _
 
 	// schemas is the ordered list of all schemas in the lineage.
 	//
@@ -256,7 +257,7 @@ import (
 
 	_#schema: _join & schema
 
-	_schemaIsNonEmpty: struct.MinFields(1) & _#schema
+	//	_schemaIsNonEmpty: struct.MinFields(1) & _#schema
 
 	// examples is an optional set of named examples of the schema, intended
 	// for use in documentation or other non-functional contexts.
diff --git a/lineage_test.go b/lineage_test.go
index 997b7c82..dd15c786 100644
--- a/lineage_test.go
+++ b/lineage_test.go
@@ -57,6 +57,7 @@ func TestInvalidLineages(t *testing.T) {
 		ToDo: map[string]string{
 			"invalidlineage/defaultchange": "Thema compat analyzer fails to classify changes to default values as breaking",
 			"invalidlineage/joindef":       "no invariant checker written to disallow definitions from joinSchema",
+			"invalidlineage/onlydef":       "Lineage schema non-emptiness constraints are temporarily suspended while migrating grafana to flattened lineage structure",
 		},
 	}
 
diff --git a/testdata/invalidlineage/empty-schemas.txtar b/testdata/invalidlineage/empty-schemas.txtar
index 0009801d..e8dec32b 100644
--- a/testdata/invalidlineage/empty-schemas.txtar
+++ b/testdata/invalidlineage/empty-schemas.txtar
@@ -6,8 +6,8 @@ thema.#Lineage
 name: "empty-schemas"
 schemas: []
 -- out/bindfail --
-schemas: incompatible list lengths (0 and 1)
+incompatible list lengths (0 and 1)
 _sortedSchemas: invalid value [] (does not satisfy list.MinItems(1)): len(list) < MinItems(1) (0 < 1):
-    ../../lineage.cue:97:7
-    ../../lineage.cue:93:21
-    ../../lineage.cue:97:21
+    ../../lineage.cue:98:7
+    ../../lineage.cue:94:21
+    ../../lineage.cue:98:21
diff --git a/testdata/invalidlineage/second-schema-versionless.txtar b/testdata/invalidlineage/second-schema-versionless.txtar
index 71775792..7d88c1d9 100644
--- a/testdata/invalidlineage/second-schema-versionless.txtar
+++ b/testdata/invalidlineage/second-schema-versionless.txtar
@@ -32,8 +32,8 @@ lenses: [
 ]
 -- out/bindfail --
 _schemasAreOrdered.1: conflicting values true and false:
-    ../../lineage.cue:124:3
-    ../../lineage.cue:125:4
-    ../../lineage.cue:130:5
-    ../../lineage.cue:131:11
+    ../../lineage.cue:125:3
+    ../../lineage.cue:126:4
+    ../../lineage.cue:131:5
+    ../../lineage.cue:132:11
     ./in.cue:4:1