# Enabling automatic data type conversion

## Before you begin

When processing data flows using a tMap, if the input and output columns across a mapping are of different data types, compiling errors may occur at the Job execution time. The Enable Auto-Conversion of types option in the tMap helps avoid such errors.

To enable this feature in tMap in a Job:

## Procedure

1. Click ![Setup the configurations of tMap](https://help.qlik.com/talend/en-US/studio-user-guide/Resources/images/property.svg) at the top of the Map Editor to open the Property Settings dialog box.
2. Select the Enable Auto-Conversion of types check box and then click OK.

   ![Property Settings dialog box.](https://help.qlik.com/talend/en-US/studio-user-guide/Resources/images/tmap_auto_type_conversion.png)

## What to do next

You can activate the automatic conversion option at the project level so that any tMap component added afterwards in the project will have this feature enabled.