# ... configure a Cron Expression

When defining a Contract in Data One, you can create a Cron expression either with the **GENERATE** button or manually inserting the Cron expression directly in the field.

<figure><img src="/files/Yo5m7riMkY2KswUTfeMd" alt="" width="563"><figcaption></figcaption></figure>

When you click the **GENERATE** button, a new window will appear and you will be prompted to select the seconds, minutes, hours, days and months as needed.

**You can configure only one option per tab.** When an option is set in a tab, selecting one of the other options **on the same tab** will reset all previous settings.

Let's make an example.

In the figure below, the **Specific Day of the Week** option has been set to **SUN**, **MON** and **TUE**, as it appears at the bottom of the window.

<figure><img src="/files/tZznbQtRyZxCg19PFz2i" alt="" width="482"><figcaption></figcaption></figure>

If you now click **Specific Day of the Month** in the same tab, all previous settings in this tab will return automatically to the default options - see the bottom of the window.

<figure><img src="/files/99IUF63ThVLoIRgzUSyY" alt="" width="473"><figcaption></figcaption></figure>

When you choose a tab and enter options, forget about the other options on the same tab - unless you really want to reset the values you've entered.

If no option is defined for one or more tabs, the default option will automatically be set for your Cron expression.


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