diff --git a/springdoc-openapi-starter-common/src/main/java/org/springdoc/core/converters/PolymorphicModelConverter.java b/springdoc-openapi-starter-common/src/main/java/org/springdoc/core/converters/PolymorphicModelConverter.java
index 12cec2add..1673ce8a1 100644
--- a/springdoc-openapi-starter-common/src/main/java/org/springdoc/core/converters/PolymorphicModelConverter.java
+++ b/springdoc-openapi-starter-common/src/main/java/org/springdoc/core/converters/PolymorphicModelConverter.java
@@ -21,7 +21,7 @@
  *  *  *  *
  *  *  *
  *  *
- *  
+ *
  */
 
 package org.springdoc.core.converters;
@@ -110,32 +110,35 @@ else if (resolvedSchema.getProperties().containsKey(javaType.getRawClass().getSi
 	@Override
 	public Schema resolve(AnnotatedType type, ModelConverterContext context, Iterator<ModelConverter> chain) {
 		JavaType javaType = springDocObjectMapper.jsonMapper().constructType(type.getType());
-		if (javaType != null) {
-			for (Field field : FieldUtils.getAllFields(javaType.getRawClass())) {
-				if (field.isAnnotationPresent(JsonUnwrapped.class)) {
-					PARENT_TYPES_TO_IGNORE.add(javaType.getRawClass().getSimpleName());
-				}
+
+		if (javaType == null || !chain.hasNext()) {
+			return null;
+		}
+
+		for (Field field : FieldUtils.getAllFields(javaType.getRawClass())) {
+			if (field.isAnnotationPresent(JsonUnwrapped.class)) {
+				PARENT_TYPES_TO_IGNORE.add(javaType.getRawClass().getSimpleName());
 			}
-			if (chain.hasNext()) {
-				if (!type.isResolveAsRef() && type.getParent() != null
-						&& PARENT_TYPES_TO_IGNORE.stream().noneMatch(ignore -> type.getParent().getName().startsWith(ignore)))
-					type.resolveAsRef(true);
-				Schema<?> resolvedSchema = chain.next().resolve(type, context, chain);
-				resolvedSchema = getResolvedSchema(javaType, resolvedSchema);
-				if (resolvedSchema == null || resolvedSchema.get$ref() == null) {
-					return resolvedSchema;
-				}
-				if(resolvedSchema.get$ref().contains(Components.COMPONENTS_SCHEMAS_REF)) {
-					String schemaName = resolvedSchema.get$ref().substring(Components.COMPONENTS_SCHEMAS_REF.length());
-					Schema existingSchema = context.getDefinedModels().get(schemaName);
-					if (existingSchema != null && existingSchema.getOneOf() != null) {
-						return resolvedSchema;
-					}
-				}
-				return composePolymorphicSchema(type, resolvedSchema, context.getDefinedModels().values());
+		}
+
+		String parentName = type.getParent() == null ? null : type.getParent().getName();
+		if (parentName != null && PARENT_TYPES_TO_IGNORE.stream().noneMatch(parentName::startsWith)){
+			type.resolveAsRef(true);
+		}
+
+		Schema<?> resolvedSchema = getResolvedSchema(javaType, chain.next().resolve(type, context, chain));
+		if (resolvedSchema == null || resolvedSchema.get$ref() == null) {
+			return resolvedSchema;
+		}
+
+		if(resolvedSchema.get$ref().contains(Components.COMPONENTS_SCHEMAS_REF)) {
+			String schemaName = resolvedSchema.get$ref().substring(Components.COMPONENTS_SCHEMAS_REF.length());
+			Schema existingSchema = context.getDefinedModels().get(schemaName);
+			if (existingSchema != null && (existingSchema.getOneOf() != null || existingSchema.getAllOf() != null || existingSchema.getAnyOf() != null)) {
+				return resolvedSchema;
 			}
 		}
-		return null;
+		return composePolymorphicSchema(type, resolvedSchema, context.getDefinedModels().values());
 	}
 
 	/**
diff --git a/springdoc-openapi-tests/springdoc-openapi-kotlin-webmvc-tests/src/test/kotlin/test/org/springdoc/api/app13/SpringDocApp13Test.kt b/springdoc-openapi-tests/springdoc-openapi-kotlin-webmvc-tests/src/test/kotlin/test/org/springdoc/api/app13/SpringDocApp13Test.kt
new file mode 100644
index 000000000..1f2f41145
--- /dev/null
+++ b/springdoc-openapi-tests/springdoc-openapi-kotlin-webmvc-tests/src/test/kotlin/test/org/springdoc/api/app13/SpringDocApp13Test.kt
@@ -0,0 +1,49 @@
+/*
+ *
+ *  * Copyright 2019-2020 the original author or authors.
+ *  *
+ *  * Licensed under the Apache License, Version 2.0 (the "License");
+ *  * you may not use this file except in compliance with the License.
+ *  * You may obtain a copy of the License at
+ *  *
+ *  *      https://www.apache.org/licenses/LICENSE-2.0
+ *  *
+ *  * Unless required by applicable law or agreed to in writing, software
+ *  * distributed under the License is distributed on an "AS IS" BASIS,
+ *  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  * See the License for the specific language governing permissions and
+ *  * limitations under the License.
+ *
+ */
+
+package test.org.springdoc.api.app13
+
+import org.springdoc.core.properties.SpringDocConfigProperties
+import org.springdoc.core.properties.SpringDocConfigProperties.ApiDocs.OpenApiVersion
+import org.springframework.boot.autoconfigure.SpringBootApplication
+import org.springframework.boot.test.context.SpringBootTest
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+import test.org.springdoc.api.AbstractKotlinSpringDocMVCTest
+
+
+@SpringBootTest//(classes = [Config::class])
+class SpringDocApp13Test : AbstractKotlinSpringDocMVCTest() {
+
+
+    @Configuration
+    class Config{
+        @Bean
+        fun springDocConfigProperties():SpringDocConfigProperties{
+            val x= SpringDocConfigProperties()
+            x.apiDocs.version = OpenApiVersion.OPENAPI_3_1
+            return x
+        }
+
+    }
+
+
+    @SpringBootApplication
+    class DemoApplication
+
+}
diff --git a/springdoc-openapi-tests/springdoc-openapi-kotlin-webmvc-tests/src/test/kotlin/test/org/springdoc/api/app13/TestController.kt b/springdoc-openapi-tests/springdoc-openapi-kotlin-webmvc-tests/src/test/kotlin/test/org/springdoc/api/app13/TestController.kt
new file mode 100644
index 000000000..7ec21bac8
--- /dev/null
+++ b/springdoc-openapi-tests/springdoc-openapi-kotlin-webmvc-tests/src/test/kotlin/test/org/springdoc/api/app13/TestController.kt
@@ -0,0 +1,51 @@
+/*
+ *
+ *  * Copyright 2019-2020 the original author or authors.
+ *  *
+ *  * Licensed under the Apache License, Version 2.0 (the "License");
+ *  * you may not use this file except in compliance with the License.
+ *  * You may obtain a copy of the License at
+ *  *
+ *  *      https://www.apache.org/licenses/LICENSE-2.0
+ *  *
+ *  * Unless required by applicable law or agreed to in writing, software
+ *  * distributed under the License is distributed on an "AS IS" BASIS,
+ *  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  * See the License for the specific language governing permissions and
+ *  * limitations under the License.
+ *
+ */
+
+package test.org.springdoc.api.app13
+
+
+import io.swagger.v3.oas.annotations.OpenAPI31
+import io.swagger.v3.oas.annotations.media.Schema
+import org.springframework.web.bind.annotation.PostMapping
+import org.springframework.web.bind.annotation.RequestBody
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RestController
+
+@Schema(description = "Generic description")
+data class KeyValue(
+    val key: String,
+    val value: String,
+)
+
+@Schema
+data class SomeDTO(
+    @Schema(description = "Description A") val fieldA: KeyValue,
+    @Schema(description = "Description B") val fieldB: KeyValue,
+)
+
+
+
+@RestController
+@RequestMapping("/test")
+class TestController {
+    @PostMapping("/test")
+    fun create(@RequestBody some: SomeDTO) {
+
+    }
+}
+
diff --git a/springdoc-openapi-tests/springdoc-openapi-kotlin-webmvc-tests/src/test/resources/results/app13.json b/springdoc-openapi-tests/springdoc-openapi-kotlin-webmvc-tests/src/test/resources/results/app13.json
new file mode 100644
index 000000000..6bf07eb5b
--- /dev/null
+++ b/springdoc-openapi-tests/springdoc-openapi-kotlin-webmvc-tests/src/test/resources/results/app13.json
@@ -0,0 +1,68 @@
+{
+  "openapi" : "3.1.0",
+  "info" : {
+    "title" : "OpenAPI definition",
+    "version" : "v0"
+  },
+  "servers" : [ {
+    "url" : "http://localhost",
+    "description" : "Generated server url"
+  } ],
+  "paths" : {
+    "/test/test" : {
+      "post" : {
+        "tags" : [ "test-controller" ],
+        "operationId" : "create",
+        "requestBody" : {
+          "content" : {
+            "application/json" : {
+              "schema" : {
+                "$ref" : "#/components/schemas/SomeDTO"
+              }
+            }
+          },
+          "required" : true
+        },
+        "responses" : {
+          "200" : {
+            "description" : "OK"
+          }
+        }
+      }
+    }
+  },
+  "components" : {
+    "schemas" : {
+      "KeyValue" : {
+        "required" : [ "key", "value" ],
+        "type" : "object",
+        "description" : "Generic description",
+        "properties" : {
+          "key" : {
+            "type" : "string"
+          },
+          "value" : {
+            "type" : "string"
+          }
+        }
+      },
+      "SomeDTO" : {
+        "required": [
+          "fieldA",
+          "fieldB"
+        ],
+        "type": "object",
+        "properties": {
+          "fieldA": {
+            "description": "Description A",
+            "$ref": "#/components/schemas/KeyValue"
+          },
+          "fieldB": {
+            "description": "Description B",
+            "$ref": "#/components/schemas/KeyValue"
+          }
+        }
+      }
+    }
+  }
+}
\ No newline at end of file