diff --git a/lib/base/VariableResolver.js b/lib/base/VariableResolver.js
index 83a9dd1..a383543 100644
--- a/lib/base/VariableResolver.js
+++ b/lib/base/VariableResolver.js
@@ -1,6 +1,7 @@
 import { getBusinessObject, is } from 'bpmn-js/lib/util/ModelUtil';
 import CachedValue from './util/CachedValue';
 import { getParents, getScope } from './util/scopeUtil';
+import { uniqueBy } from 'min-dash';
 
 /**
  * @typedef {Object} AdditionalVariable
@@ -257,15 +258,18 @@ export class BaseVariableResolver {
     const root = getRootElement(bo);
     const allVariables = await this.getProcessVariables(root);
 
+    // keep only unique variables based on name property
+    const uniqueVariables = uniqueBy('name',allVariables.reverse());
+
     // (1) get variables for given scope
-    var scopeVariables = allVariables.filter(function(variable) {
+    var scopeVariables = uniqueVariables.filter(function(variable) {
       return variable.scope.id === bo.id;
     });
 
     // (2) get variables for parent scopes
     var parents = getParents(bo);
 
-    var parentsScopeVariables = allVariables.filter(function(variable) {
+    var parentsScopeVariables = uniqueVariables.filter(function(variable) {
       return parents.find(function(parent) {
         return parent.id === variable.scope.id;
       });
diff --git a/lib/zeebe/VariableResolver.js b/lib/zeebe/VariableResolver.js
index 5a032a6..d3f5054 100644
--- a/lib/zeebe/VariableResolver.js
+++ b/lib/zeebe/VariableResolver.js
@@ -10,7 +10,6 @@ import {
 } from 'bpmn-js/lib/util/ModelUtil';
 import { getInputOutput } from '../base/util/ExtensionElementsUtil';
 
-
 const HIGH_PRIORITY = 2000;
 
 /**
@@ -40,8 +39,7 @@ export default class ZeebeVariableResolver extends BaseVariableResolver {
     }
 
     const namesToFilter = getElementNamesToRemove(moddleElement, inputOutput);
-
-    return variables.filter(v => {
+    return variables.filter(v=> {
 
       // Keep all variables that are also defined in other elements
       if (v.origin.length > 1 || v.origin[0] !== bo) {
diff --git a/lib/zeebe/util/feelUtility.js b/lib/zeebe/util/feelUtility.js
index e71461c..0a90713 100644
--- a/lib/zeebe/util/feelUtility.js
+++ b/lib/zeebe/util/feelUtility.js
@@ -159,7 +159,12 @@ export function getResultContext(expression, variables = {}) {
  * @returns {{ expression: String, unresolved: Array<String> }}}
  */
 function getExpressionDetails(variable, origin) {
-  const expression = getScriptExpression(variable, origin) || getIoExpression(variable, origin);
+
+  // if variable scope is parent scope, first check IoExpression and then ScriptExpression
+  // if variable is local scope (origin), first check ScriptExpression and then IoExpression
+  const expression = variable.scope !== origin
+    ? getIoExpression(variable, origin) || getScriptExpression(variable, origin)
+    : getScriptExpression(variable, origin) || getIoExpression(variable, origin);
 
   if (!expression) {
     return;