diff --git a/obp-api/src/main/scala/code/api/util/APIUtil.scala b/obp-api/src/main/scala/code/api/util/APIUtil.scala
index 3a2d93e77..16105575f 100644
--- a/obp-api/src/main/scala/code/api/util/APIUtil.scala
+++ b/obp-api/src/main/scala/code/api/util/APIUtil.scala
@@ -118,6 +118,8 @@ import java.security.AccessControlException
 import java.util.regex.Pattern
 
 import code.api.util.FutureUtil.{EndpointContext, EndpointTimeout}
+import code.api.v2_1_0.OBPAPI2_1_0.Implementations2_1_0
+import code.api.v2_2_0.OBPAPI2_2_0.Implementations2_2_0
 import code.etag.MappedETag
 import code.users.Users
 import net.liftweb.mapper.By
@@ -643,7 +645,18 @@ object APIUtil extends MdcLoggable with CustomJsonFormats{
   val excludedFieldValues = APIUtil.getPropsValue("excluded.response.field.values").map[JArray](it => json.parse(it).asInstanceOf[JArray])
 
   def successJsonResponseNewStyle(cc: Any, callContext: Option[CallContext], httpCode : Int = 200)(implicit headers: CustomResponseHeaders = CustomResponseHeaders(Nil)) : JsonResponse = {
-    val jsonAst: JValue = ApiSession.processJson((Extraction.decompose(cc)), callContext)
+    val jsonAst: JValue = {
+      val partialFunctionName = callContext.map(_.resourceDocument.map(_.partialFunctionName)).flatten.getOrElse("")
+      if (
+        nameOf(code.api.v5_1_0.APIMethods510.Implementations5_1_0.getMetrics).equals(partialFunctionName) ||
+        nameOf(code.api.v5_0_0.APIMethods500.Implementations5_0_0.getMetricsAtBank).equals(partialFunctionName) ||
+        nameOf(Implementations2_2_0.getConnectorMetrics).equals(partialFunctionName)
+      ) {
+        ApiSession.processJson(Extraction.decompose(cc)(CustomJsonFormats.losslessFormats), callContext)
+      } else {
+        ApiSession.processJson((Extraction.decompose(cc)), callContext)
+      }
+    }
     val excludeOptionalFieldsParam = getHttpRequestUrlParam(callContext.map(_.url).getOrElse(""),"exclude-optional-fields")
     val excludedResponseBehaviour = APIUtil.getPropsAsBoolValue("excluded.response.behaviour", false)
     //excludeOptionalFieldsParamValue has top priority, then the excludedResponseBehaviour props.