# Bug OP-7514 - Gantt Chart: Back-end - Front-end discrepancies when dragging a work package produces an error

Project: OpenProject
Status: closed
URL: https://community.openproject.org/work_packages/OP-7514

## Open points

_No work packages_

## Details

| Attribute | Value |
| --- | --- |
| Date |  |
| Priority | High |
| Module |  |
| Target versions | 11.0.0 |
| Observed in versions | 10.6.0 |
| Sprint | 11.0.0 |
| Backlog bucket |  |
| Bug found in version (deprecated) | 10.6.x |
| Found in mobile app version |  |
| Follow-up feedback e-mail |  |
| Requires doc change | No |
| Accessibility | No |
| Pull preview |  |
| List |  |
| Labels |  |

## People

| Attribute | Value |
| --- | --- |
| Assignee |  |
| Accountable |  |
| Product manager |  |
| Developers |  |
| Designer |  |
| Ordered by |  |
| Signed off by |  |
| Interest by |  |

## Planning

| Attribute | Value |
| --- | --- |
| Relevance |  |

## Costs

| Attribute | Value |
| --- | --- |
| Votes |  |
| Work |  |
| Labor costs |  |

## Description

### **Environment**:

Your OpenProject Version: 10.6

Operating System / Browser / Language: mac / Chrome

### **Logs**

No

### **Steps to reproduce:**

1.  Go to Gantt Chart
2.  Move a child work package out of the parent start date

### **Actual Behavior**

Depending on the parent work package settings this change is rejected by the back-end and produces an error, but the view reflects the wrong change.  
  

![](/api/v3/attachments/18911/content)

### **Expected Behavior**

Describe the expected behavior.