[DATALAB-2430] -- fixed tests
diff --git a/services/self-service/src/main/java/com/epam/datalab/backendapi/resources/aws/ComputationalResourceAws.java b/services/self-service/src/main/java/com/epam/datalab/backendapi/resources/aws/ComputationalResourceAws.java
index baaf397..f0f8d29 100644
--- a/services/self-service/src/main/java/com/epam/datalab/backendapi/resources/aws/ComputationalResourceAws.java
+++ b/services/self-service/src/main/java/com/epam/datalab/backendapi/resources/aws/ComputationalResourceAws.java
@@ -217,7 +217,7 @@
 
     private void validate(SparkStandaloneClusterCreateForm form) {
 
-        int instanceCount = Integer.parseInt(form.getDataEngineInstanceCount());
+        int instanceCount = Integer.parseInt(form.getMasterDataEngineInstanceCount());
 
         if (instanceCount < configuration.getMinSparkInstanceCount()
                 || instanceCount > configuration.getMaxSparkInstanceCount()) {