diff --git a/obp-api/src/main/scala/code/api/util/migration/Migration.scala b/obp-api/src/main/scala/code/api/util/migration/Migration.scala
index ed8fefb1fa..517263a544 100644
--- a/obp-api/src/main/scala/code/api/util/migration/Migration.scala
+++ b/obp-api/src/main/scala/code/api/util/migration/Migration.scala
@@ -157,6 +157,7 @@ object Migration extends MdcLoggable {
       migrateMetricConsentReferenceId(startedBeforeSchemifier)
       migrateMetricCertificateTrust(startedBeforeSchemifier)
       dropFastFirehoseAccountsViews(startedBeforeSchemifier)
+      alterDynamicResourceDocBodyFieldsLength()
     }
 
     /**
@@ -511,6 +512,13 @@ object Migration extends MdcLoggable {
     // Retire the fast-firehose SQL views (firehose -> account directory + ABAC). Runs after the create
     // migrations above, so a fresh DB creates-then-drops them and an existing DB just drops them. See
     // MigrationOfDropFastFireHoseViews.
+    private def alterDynamicResourceDocBodyFieldsLength(): Boolean = {
+      val name = nameOf(alterDynamicResourceDocBodyFieldsLength)
+      runOnce(name) {
+        MigrationOfDynamicResourceDocBodyFieldsLength.alterColumnsType(name)
+      }
+    }
+
     private def dropFastFirehoseAccountsViews(startedBeforeSchemifier: Boolean): Boolean = {
       if(startedBeforeSchemifier == true) {
         logger.warn(s"Migration.database.dropFastFirehoseAccountsViews(true) cannot be run before Schemifier.")
diff --git a/obp-api/src/main/scala/code/api/util/migration/MigrationOfDynamicResourceDocBodyFieldsLength.scala b/obp-api/src/main/scala/code/api/util/migration/MigrationOfDynamicResourceDocBodyFieldsLength.scala
new file mode 100644
index 0000000000..187ab049cf
--- /dev/null
+++ b/obp-api/src/main/scala/code/api/util/migration/MigrationOfDynamicResourceDocBodyFieldsLength.scala
@@ -0,0 +1,64 @@
+package code.api.util.migration
+
+import code.api.util.APIUtil
+import code.api.util.migration.Migration.{DbFunction, saveLog}
+import code.dynamicResourceDoc.DynamicResourceDoc
+import net.liftweb.common.Full
+import net.liftweb.mapper.Schemifier
+
+object MigrationOfDynamicResourceDocBodyFieldsLength {
+
+  def alterColumnsType(name: String): Boolean = {
+    DbFunction.tableExists(DynamicResourceDoc) match {
+      case true =>
+        val startDate = System.currentTimeMillis()
+        val commitId: String = APIUtil.gitCommit
+        var isSuccessful = false
+
+        val executedSql =
+          DbFunction.maybeWrite(true, Schemifier.infoF _) {
+            APIUtil.getPropsValue("db.driver") match {
+              case Full(dbDriver) if dbDriver.contains("com.microsoft.sqlserver.jdbc.SQLServerDriver") =>
+                () =>
+                  """
+                    |-- A realistic dynamic-endpoint request/response body example (or full error
+                    |-- response list) routinely exceeds varchar(255) once it has more than a
+                    |-- handful of JSON fields
+                    |ALTER TABLE dynamicresourcedoc ALTER COLUMN examplerequestbody VARCHAR(MAX);
+                    |ALTER TABLE dynamicresourcedoc ALTER COLUMN successresponsebody VARCHAR(MAX);
+                    |ALTER TABLE dynamicresourcedoc ALTER COLUMN errorresponsebodies VARCHAR(MAX);
+                    |""".stripMargin
+              case _ =>
+                () =>
+                  """
+                    |-- A realistic dynamic-endpoint request/response body example (or full error
+                    |-- response list) routinely exceeds varchar(255) once it has more than a
+                    |-- handful of JSON fields
+                    |ALTER TABLE dynamicresourcedoc ALTER COLUMN examplerequestbody TYPE text;
+                    |ALTER TABLE dynamicresourcedoc ALTER COLUMN successresponsebody TYPE text;
+                    |ALTER TABLE dynamicresourcedoc ALTER COLUMN errorresponsebodies TYPE text;
+                    |""".stripMargin
+            }
+          }
+
+        val endDate = System.currentTimeMillis()
+        val comment: String =
+          s"""Executed SQL:
+             |$executedSql
+             |""".stripMargin
+        isSuccessful = true
+        saveLog(name, commitId, isSuccessful, startDate, endDate, comment)
+        isSuccessful
+
+      case false =>
+        val startDate = System.currentTimeMillis()
+        val commitId: String = APIUtil.gitCommit
+        val isSuccessful = false
+        val endDate = System.currentTimeMillis()
+        val comment: String =
+          s"""${DynamicResourceDoc._dbTableNameLC} table does not exist""".stripMargin
+        saveLog(name, commitId, isSuccessful, startDate, endDate, comment)
+        isSuccessful
+    }
+  }
+}
diff --git a/obp-api/src/main/scala/code/api/v1_4_0/JSONFactory1_4_0.scala b/obp-api/src/main/scala/code/api/v1_4_0/JSONFactory1_4_0.scala
index b70552fe01..b850b84581 100644
--- a/obp-api/src/main/scala/code/api/v1_4_0/JSONFactory1_4_0.scala
+++ b/obp-api/src/main/scala/code/api/v1_4_0/JSONFactory1_4_0.scala
@@ -522,7 +522,13 @@ object JSONFactory1_4_0 extends MdcLoggable{
   }
   
   def checkFieldOption(jsonBody: Any, rootFields: List[Field]) = {
-    val types = rootFields.map(f => (f.getName(), f.getType().getCanonicalName().contains("Option")))
+    // getCanonicalName() is null for a local/anonymous class (Java reflection spec) -- which is
+    // exactly what a nested case class declared inside a runtime-compiled DynamicResourceDoc
+    // method body is, from the JVM's perspective (e.g. an example_request_body with a nested
+    // object generates a locally-scoped case class for that object's type). A field whose
+    // declared type is such a class is never itself an Option (Option's own canonical name is
+    // always present, since scala.Option is a top-level class), so None safely defaults to false.
+    val types = rootFields.map(f => (f.getName(), Option(f.getType().getCanonicalName()).exists(_.contains("Option"))))
     (decompose(jsonBody), types)
   }
   
diff --git a/obp-api/src/main/scala/code/dynamicResourceDoc/DynamicResourceDoc.scala b/obp-api/src/main/scala/code/dynamicResourceDoc/DynamicResourceDoc.scala
index d11c21ae41..a96c164350 100644
--- a/obp-api/src/main/scala/code/dynamicResourceDoc/DynamicResourceDoc.scala
+++ b/obp-api/src/main/scala/code/dynamicResourceDoc/DynamicResourceDoc.scala
@@ -19,9 +19,9 @@ class DynamicResourceDoc extends LongKeyedMapper[DynamicResourceDoc] with IdPK w
   object RequestUrl extends MappedString(this, 255)
   object Summary extends MappedString(this, 255)
   object Description extends MappedString(this, 255)
-  object ExampleRequestBody extends MappedString(this, 255)
-  object SuccessResponseBody extends MappedString(this, 255)
-  object ErrorResponseBodies extends MappedString(this, 255)
+  object ExampleRequestBody extends MappedText(this)
+  object SuccessResponseBody extends MappedText(this)
+  object ErrorResponseBodies extends MappedText(this)
   object Tags extends MappedString(this, 255)
   object Roles extends MappedString(this, 255)
   object MethodBody extends MappedText(this)