# List Modified by Another User QuickBooks Desktop Error when saving Customer List

#### Summary

This article explains how to identify and resolve the issue&#x20;

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#### Problem

When syncing records from Salesforce (or any source system) to QuickBooks Desktop DBSync, the sync fails with the following error message:

There was an error when saving a Customer list, element "Criticality". QuickBooks error message: This list has been modified by another user.

#### Applies To

**Product/Service**: DBSync Cloud Workflow

**Versions**: All versions supporting Salesforce-QBD integration

**Operating Systems**: Platform-independent (Cloud-based)

**Databases / Connectors**: Salesforce, QBD

**Applicable To**: Only to QuickBooks Desktop (QBD)

#### Solution

**Prerequisites**:

* Admin access to DBSync
* Access to Salesforce (Source)and QBD instance if required.

After reviewing the DBSync logs, you will discover the following error. This error can occur when another user is editing or has opened any existing Customers in QuickBooks. If you encounter this problem with new Accounts, attempt to resynchronize them, and the records will synchronize effectively.

#### Workaround (If Applicable)

When this error occurs:

* Re-query the Customer record using ListID to get the latest EditSequence.
* Retry the update using this latest EditSequence.

#### Root Cause

This is a QuickBooks Desktop concurrency conflict error. It means that while DBSync (or your integration process) was trying to update a Customer record, another user or process (human or automated) had already modified that same record in QuickBooks.

QuickBooks uses internal record versioning (edit sequences), and if the edit sequence passed to QuickBooks is outdated, it throws this error to avoid overwriting someone else's changes.

#### Additional Information

<https://help.developer.intuit.com/s/question/0D54R00007g0DHtSAM/qbxml-error-this-list-has-been-modified-by-another-user-same-error-with-both-customer-and-item-createupdate-this-error-occurred-even-the-user-use-it-in-singleuser-mode-with-no-other-window-open-in-qb>


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