diff --git a/cloudslang-compiler/src/main/java/io/cloudslang/lang/compiler/modeller/transformers/SeqStepsTransformer.java b/cloudslang-compiler/src/main/java/io/cloudslang/lang/compiler/modeller/transformers/SeqStepsTransformer.java
index 61dcacf68d..976803d0d6 100644
--- a/cloudslang-compiler/src/main/java/io/cloudslang/lang/compiler/modeller/transformers/SeqStepsTransformer.java
+++ b/cloudslang-compiler/src/main/java/io/cloudslang/lang/compiler/modeller/transformers/SeqStepsTransformer.java
@@ -51,7 +51,8 @@ public class SeqStepsTransformer extends AbstractInOutForTransformer
             SEQ_STEP_PATH_KEY, SEQ_STEP_ACTION_KEY);
     private static final Set<String> WAIT_MANDATORY_KEYS = newHashSet(SEQ_STEP_ID_KEY, SEQ_STEP_ACTION_KEY,
             SEQ_STEP_DEFAULT_ARGS_KEY);
-    private static final Set<String> WAIT_OPTIONAL_KEY_SET = newHashSet(SEQ_STEP_ARGS_KEY, SEQ_STEP_COMMENT_KEY);
+    private static final Set<String> WAIT_OPTIONAL_KEY_SET = newHashSet(SEQ_STEP_ARGS_KEY, SEQ_STEP_COMMENT_KEY,
+            SEQ_STEP_HIGHLIGHT_ID_KEY, SEQ_STEP_SNAPSHOT_KEY);
     private static final Set<String> OPTIONAL_KEY_SET = newHashSet(SEQ_STEP_ARGS_KEY,
             SEQ_STEP_DEFAULT_ARGS_KEY, SEQ_STEP_HIGHLIGHT_ID_KEY,
             SEQ_STEP_SNAPSHOT_KEY, SEQ_STEP_NAME_KEY, SEQ_STEP_COMMENT_KEY);