# Edit a Replication mapping

[](https://help.qlik.com/talend/en-US/talend-data-catalog/Content/user-guide/data-mapping/edit-a-replication-mapping.htm)

A replication mapping is useful when modeling data replication technologies. Each replication mapping is defined for one target schema and one source schema.

Information note

It is important to understand that a replication mapping is dynamically re-calculated every time you re-build the configuration. This means that while the source and target data store columns may change every time you harvest them, you do not need to rebuild these replication mappings. The magic wand gives you the illusion that the name mapping is performed in the data mapping tool but that is only for illustration of this replication mapping at that point in time. The column mapping is not hard coded in that replication mapping. Instead only a replication mapping between tables is recorded and the column mappings are re-evaluated at every configuration build.

**Steps**

Ensure proper permissions

1. Sign in as a user with at least the **Metadata Editing** [capability object role assignment](https://help.qlik.com/talend/en-US/talend-data-catalog/Cloud/Content/user-guide/administration-and-system-management/manage-object-roles.htm) on the Data Mapping you are going to edit.

Navigate to the mapping to edit

1. [Navigate](https://help.qlik.com/talend/en-US/talend-data-catalog/Cloud/Content/user-guide/explore/index.htm) to the [object page](https://help.qlik.com/talend/en-US/talend-data-catalog/Cloud/Content/user-guide/analyze/object-page.htm) for the data mapping model and navigate to the folder if necessary.

2. [Create](https://help.qlik.com/talend/en-US/talend-data-catalog/Cloud/Content/user-guide/data-mapping/create-a-data-mapping.htm) the replication mapping if necessary.

3. Click the **Replication** **Mappings** tab.

4. Click to open the replication mapping.

5. Click **START EDITING.**

Assign target and source

1. Click Select a target schema.

2. Specify filters to narrow down the choices and select a schema from the list.

3. Click Select a source schema.

4. Specify filters to narrow down the choices and select a schema from the list.

Map

1. Click the Detect Links magic wand to automatically match tables and columns.

2. Drag a specific source table to target table to map all the columns.

3. Click **Save**.

**Example**

Create a new data mapping model

Go to the **Manage > Configuration** in the banner. Click the **Add** plus sign *s* and select **Data Mapping**.

![](https://help.qlik.com/talend/en-US/talend-data-catalog/Cloud/Content/user-guide/data-mapping/img/image1008.png)

Enter a **NAME** and **DEFINITION** for the model and click **OK**.

Specify a **Model scope**, to restrict the object pickers to only those models you wish to include in the mapping. In this case, **SOURCE MODELS** should be the **Dimensional DW** model and the **DESTINATION MODELS should be Vendor Mart.**

![](https://help.qlik.com/talend/en-US/talend-data-catalog/Cloud/Content/user-guide/data-mapping/img/image1009.png)

Create a Replication Mapping

Click **Open**. Click the **Replication Mappings** tab. Click **+Create**. Enter the **NAME** and **DEFINITION**.

![](https://help.qlik.com/talend/en-US/talend-data-catalog/Cloud/Content/user-guide/data-mapping/img/image1010.png)

Click the mapping to open. Click +Create and specify **Multiple**.

![](https://help.qlik.com/talend/en-US/talend-data-catalog/Cloud/Content/user-guide/data-mapping/img/image1011.png)

![](https://help.qlik.com/talend/en-US/talend-data-catalog/Cloud/Content/user-guide/data-mapping/img/image1012.png)

Click SOURCE APRENT, expand to the **dbo** schema in the **Dimensional DW** model and select the **dbo** schema (the only one now there with the filter).

![](https://help.qlik.com/talend/en-US/talend-data-catalog/Cloud/Content/user-guide/data-mapping/img/image1013.png)

Click **OK**.

Do the same for the **DESTINATION PARENT**, selecting the **dbo** schema in the **Vendor Mart** model. Click **OK**.

![](https://help.qlik.com/talend/en-US/talend-data-catalog/Cloud/Content/user-guide/data-mapping/img/image1014.png)

Click **OK**.

![](https://help.qlik.com/talend/en-US/talend-data-catalog/Cloud/Content/user-guide/data-mapping/img/image1015.png)

Click **OK**.

![](https://help.qlik.com/talend/en-US/talend-data-catalog/Cloud/Content/user-guide/data-mapping/img/image1016.png)

Click **Save**.