# Concurrency
When multiple users are collaborating on the same Qommentary Writeback extension, there might be a risk of overriding someone else's data. To prevent these issues, Qommentary provides a versioning control at a record level.
To enable concurrency
1\. Add an extra column with the type **integer** or **datetime** in the destination table
{% hint style="info" %}
Set the appropiate type based on the database engine \
(e.g. for *SQL Server*, integer maps to **int** and datetime to **datetime**)
{% endhint %}
2\. Select the writeback extension and expand the Data Connections section
3\. Select the concurreny type
| Concurreny Type | Description |
| --------------- | -------------------------------------------------------------------------------------- |
| Integer | Qommentary will increment the value of the integer in 1 every time a record is updated |
| DateTime | Qommentary will generate a timestamp every time a record is updated |
4\. Enter the name of the concurrency colum
{% hint style="info" %}
This is the name of the column you added in Step1
{% endhint %}
