diff --git a/src/main/java/org/gcube/data/analysis/dataminermanagercl/server/dmservice/SClient4WPS.java b/src/main/java/org/gcube/data/analysis/dataminermanagercl/server/dmservice/SClient4WPS.java
index 755c6f4..e7f2dbf 100644
--- a/src/main/java/org/gcube/data/analysis/dataminermanagercl/server/dmservice/SClient4WPS.java
+++ b/src/main/java/org/gcube/data/analysis/dataminermanagercl/server/dmservice/SClient4WPS.java
@@ -871,18 +871,31 @@ public class SClient4WPS extends SClient {
 				+ "&DataInputs=";
 
 		for (String key : equivalentRequestMap.keySet()) {
-			String value = "";
+			String keyEncoded = "";
 			try {
-				value = URLEncoder.encode(equivalentRequestMap.get(key),
+				keyEncoded = URLEncoder.encode(key, "UTF-8");
+			} catch (UnsupportedEncodingException e) {
+				logger.error(
+						"Error in equivalent request creation: Unsupported Encoding for parameter="
+								+ key, e);
+				break;
+			}
+
+			String valueEncoded = "";
+			try {
+				valueEncoded = URLEncoder.encode(equivalentRequestMap.get(key),
 						"UTF-8");
 			} catch (UnsupportedEncodingException e) {
 				logger.error(
-						"Error in equivalent request creation: Unsupported Encoding for key="
-								+ key, e);
+						"Error in equivalent request creation: Unsupported Encoding for value="
+								+ equivalentRequestMap.get(key)
+								+ " of parameter=" + key, e);
+				break;
 			}
-
-			equivalentRequest = equivalentRequest + key + "=" + value + ";";
+			equivalentRequest = equivalentRequest + keyEncoded + "="
+					+ valueEncoded + ";";
 		}
+
 		return equivalentRequest;
 	}
 
@@ -1428,17 +1441,31 @@ public class SClient4WPS extends SClient {
 				+ computationProperties.get("operator_id") + "&DataInputs=";
 
 		for (String key : equivalentRequestMap.keySet()) {
-			String value = "";
+			String keyEncoded = "";
 			try {
-				value = URLEncoder.encode(equivalentRequestMap.get(key),
+				keyEncoded = URLEncoder.encode(key, "UTF-8");
+			} catch (UnsupportedEncodingException e) {
+				logger.error(
+						"Error in equivalent request creation: Unsupported Encoding for parameter="
+								+ key, e);
+				break;
+			}
+
+			String valueEncoded = "";
+			try {
+				valueEncoded = URLEncoder.encode(equivalentRequestMap.get(key),
 						"UTF-8");
 			} catch (UnsupportedEncodingException e) {
 				logger.error(
-						"Error in equivalent request creation: Unsupported Encoding for key="
-								+ key, e);
+						"Error in equivalent request creation: Unsupported Encoding for value="
+								+ equivalentRequestMap.get(key)
+								+ " of parameter=" + key, e);
+				break;
 			}
-			equivalentRequest = equivalentRequest + key + "=" + value + ";";
+			equivalentRequest = equivalentRequest + keyEncoded + "="
+					+ valueEncoded + ";";
 		}
+
 		return equivalentRequest;
 	}