diff --git a/components/apimgt/org.wso2.carbon.apimgt.api/src/main/java/org/wso2/carbon/apimgt/api/APIProvider.java b/components/apimgt/org.wso2.carbon.apimgt.api/src/main/java/org/wso2/carbon/apimgt/api/APIProvider.java
index d745f5900cf0..26c2c78afbd7 100644
--- a/components/apimgt/org.wso2.carbon.apimgt.api/src/main/java/org/wso2/carbon/apimgt/api/APIProvider.java
+++ b/components/apimgt/org.wso2.carbon.apimgt.api/src/main/java/org/wso2/carbon/apimgt/api/APIProvider.java
@@ -1225,6 +1225,18 @@ void deleteAPIProduct(APIProductIdentifier identifier, String apiProductUUID, St
      */
     boolean isDocumentationExist(String uuid, String docName, String organization) throws APIManagementException;
 
+    /**
+     * Checks whether the given document already exists for the given api/product
+     *
+     * @param uuid         API/Product id
+     * @param documentId         updating document id
+     * @param docOtherTypeName      Name of the other document type
+     * @param organization Identifier of the organization
+     * @return true if document already exists for the given api/product
+     * @throws APIManagementException if failed to check existence of the documentation
+     */
+    boolean isAnotherOverviewDocumentationExist(String uuid, String documentId, String docOtherTypeName, String organization) throws APIManagementException;
+
     /**
      * Add WSDL to the api. wsdl can be provided either as a url or a resource file
      * @param apiId        ID of the API
diff --git a/components/apimgt/org.wso2.carbon.apimgt.impl/src/main/java/org/wso2/carbon/apimgt/impl/APIProviderImpl.java b/components/apimgt/org.wso2.carbon.apimgt.impl/src/main/java/org/wso2/carbon/apimgt/impl/APIProviderImpl.java
index ea2dceb81065..e976d6b95c87 100644
--- a/components/apimgt/org.wso2.carbon.apimgt.impl/src/main/java/org/wso2/carbon/apimgt/impl/APIProviderImpl.java
+++ b/components/apimgt/org.wso2.carbon.apimgt.impl/src/main/java/org/wso2/carbon/apimgt/impl/APIProviderImpl.java
@@ -2518,6 +2518,27 @@ public boolean isDocumentationExist(String uuid, String docName, String organiza
         return exist;
     }
 
+    @Override
+    public boolean isAnotherOverviewDocumentationExist(String uuid, String documentId, String docOtherTypeName, String organization) throws APIManagementException {
+        boolean exist = false;
+        UserContext ctx = null;
+        try {
+            DocumentSearchResult result = apiPersistenceInstance.searchDocumentation(new Organization(organization), uuid, 0, 0,
+                    "other:_overview", ctx);
+            if (result != null && result.getDocumentationList() != null && !result.getDocumentationList().isEmpty()) {
+                String returnDocOtherTypeName = result.getDocumentationList().get(0).getOtherTypeName();
+                String returnDocId = result.getDocumentationList().get(0).getId();
+                if ((documentId == null || !documentId.equals(returnDocId))
+                        && returnDocOtherTypeName != null && returnDocOtherTypeName.equals(docOtherTypeName)) {
+                    exist = true;
+                }
+            }
+        } catch (DocumentationPersistenceException e) {
+            handleException("Failed to search documentation for other type name " + docOtherTypeName, e);
+        }
+        return exist;
+    }
+
     /**
      * Returns the details of all the life-cycle changes done per API or API Product
      *
diff --git a/components/apimgt/org.wso2.carbon.apimgt.persistence/src/main/java/org/wso2/carbon/apimgt/persistence/RegistryPersistenceImpl.java b/components/apimgt/org.wso2.carbon.apimgt.persistence/src/main/java/org/wso2/carbon/apimgt/persistence/RegistryPersistenceImpl.java
index 45f28d39027e..475f48e87a75 100644
--- a/components/apimgt/org.wso2.carbon.apimgt.persistence/src/main/java/org/wso2/carbon/apimgt/persistence/RegistryPersistenceImpl.java
+++ b/components/apimgt/org.wso2.carbon.apimgt.persistence/src/main/java/org/wso2/carbon/apimgt/persistence/RegistryPersistenceImpl.java
@@ -2817,6 +2817,13 @@ public DocumentSearchResult searchDocumentation(Organization org, String apiId,
                                     if (doc.getName().equalsIgnoreCase(requestedDocName)) {
                                         documentationList.add(doc);
                                     }
+                                }
+                                else if (searchQuery.toLowerCase().startsWith("other:")) {
+                                    String requestedDocOtherTypeName = searchQuery.split(":")[1];
+                                    if (doc.getOtherTypeName() != null
+                                            && doc.getOtherTypeName().equalsIgnoreCase(requestedDocOtherTypeName)) {
+                                        documentationList.add(doc);
+                                    }
                                 } else {
                                     log.warn("Document search not implemented for the query " + searchQuery);
                                 }
diff --git a/components/apimgt/org.wso2.carbon.apimgt.rest.api.publisher.v1.common/src/main/java/org/wso2/carbon/apimgt/rest/api/publisher/v1/common/mappings/PublisherCommonUtils.java b/components/apimgt/org.wso2.carbon.apimgt.rest.api.publisher.v1.common/src/main/java/org/wso2/carbon/apimgt/rest/api/publisher/v1/common/mappings/PublisherCommonUtils.java
index fe02de190190..4ae693cf30a8 100755
--- a/components/apimgt/org.wso2.carbon.apimgt.rest.api.publisher.v1.common/src/main/java/org/wso2/carbon/apimgt/rest/api/publisher/v1/common/mappings/PublisherCommonUtils.java
+++ b/components/apimgt/org.wso2.carbon.apimgt.rest.api.publisher.v1.common/src/main/java/org/wso2/carbon/apimgt/rest/api/publisher/v1/common/mappings/PublisherCommonUtils.java
@@ -2613,6 +2613,11 @@ public static Documentation addDocumentationToAPI(DocumentDTO documentDto, Strin
             throw new APIManagementException("Requested document '" + documentName + "' already exists",
                     ExceptionCodes.DOCUMENT_ALREADY_EXISTS);
         }
+        if (documentDto.getType() == DocumentDTO.TypeEnum.OTHER && documentDto.getOtherTypeName() != null && apiProvider
+                .isAnotherOverviewDocumentationExist(apiId, null, documentDto.getOtherTypeName(), organization)) {
+            throw new APIManagementException("Requested other document type _overview already exists",
+                    ExceptionCodes.DOCUMENT_ALREADY_EXISTS);
+        }
         documentation = apiProvider.addDocumentation(apiId, documentation, organization);
 
         return documentation;
diff --git a/components/apimgt/org.wso2.carbon.apimgt.rest.api.publisher.v1/src/main/java/org/wso2/carbon/apimgt/rest/api/publisher/v1/impl/ApiProductsApiServiceImpl.java b/components/apimgt/org.wso2.carbon.apimgt.rest.api.publisher.v1/src/main/java/org/wso2/carbon/apimgt/rest/api/publisher/v1/impl/ApiProductsApiServiceImpl.java
index 62677dfa8259..65ebf56de574 100644
--- a/components/apimgt/org.wso2.carbon.apimgt.rest.api.publisher.v1/src/main/java/org/wso2/carbon/apimgt/rest/api/publisher/v1/impl/ApiProductsApiServiceImpl.java
+++ b/components/apimgt/org.wso2.carbon.apimgt.rest.api.publisher.v1/src/main/java/org/wso2/carbon/apimgt/rest/api/publisher/v1/impl/ApiProductsApiServiceImpl.java
@@ -355,6 +355,12 @@ public Response updateAPIProductDocument(String apiProductId, String documentId,
                 RestApiUtil.handleBadRequest("Invalid document sourceUrl Format", log);
                 return null;
             }
+            if (body.getType() == DocumentDTO.TypeEnum.OTHER
+                    && body.getOtherTypeName() != null
+                    && apiProvider.isAnotherOverviewDocumentationExist(apiProductId, documentId, body.getOtherTypeName(), organization)) {
+                RestApiUtil.handleBadRequest("Requested other document type _overview already exists", log);
+                return null;
+            }
 
             //overriding some properties
             body.setName(oldDocument.getName());
@@ -449,6 +455,11 @@ public Response addAPIProductDocument(String apiProductId, DocumentDTO body,
                 String errorMessage = "Requested document '" + documentName + "' already exists";
                 RestApiUtil.handleResourceAlreadyExistsError(errorMessage, log);
             }
+            if (body.getType() == DocumentDTO.TypeEnum.OTHER
+                    && body.getOtherTypeName() != null
+                    && apiProvider.isAnotherOverviewDocumentationExist(apiProductId, null, body.getOtherTypeName(), organization)) {
+                RestApiUtil.handleBadRequest("Requested other document type _overview already exists", log);
+            }
             documentation = apiProvider.addDocumentation(apiProductId, documentation, organization);
 
             DocumentDTO newDocumentDTO = DocumentationMappingUtil.fromDocumentationToDTO(documentation);
diff --git a/components/apimgt/org.wso2.carbon.apimgt.rest.api.publisher.v1/src/main/java/org/wso2/carbon/apimgt/rest/api/publisher/v1/impl/ApisApiServiceImpl.java b/components/apimgt/org.wso2.carbon.apimgt.rest.api.publisher.v1/src/main/java/org/wso2/carbon/apimgt/rest/api/publisher/v1/impl/ApisApiServiceImpl.java
index 531a924f868d..85fea97d05a5 100644
--- a/components/apimgt/org.wso2.carbon.apimgt.rest.api.publisher.v1/src/main/java/org/wso2/carbon/apimgt/rest/api/publisher/v1/impl/ApisApiServiceImpl.java
+++ b/components/apimgt/org.wso2.carbon.apimgt.rest.api.publisher.v1/src/main/java/org/wso2/carbon/apimgt/rest/api/publisher/v1/impl/ApisApiServiceImpl.java
@@ -1918,6 +1918,12 @@ public Response updateAPIDocument(String apiId, String documentId, DocumentDTO b
                 RestApiUtil.handleBadRequest("Invalid document sourceUrl Format", log);
                 return null;
             }
+            if (body.getType() == DocumentDTO.TypeEnum.OTHER
+                    && body.getOtherTypeName() != null
+                    && apiProvider.isAnotherOverviewDocumentationExist(apiId, documentId, body.getOtherTypeName(), organization)) {
+                RestApiUtil.handleBadRequest("Requested other document type _overview already exists", log);
+                return null;
+            }
 
             //overriding some properties
             body.setName(oldDocument.getName());