# Master data cannot be synchronized

### Checking the squeeze masterdata tables in BC

In the setup for the [Squeeze master data tables](https://docs.squeeze.one/books/squeeze-for-dynamics-365-bc-en-us/page/squeeze-master-data-tables), you can see which master data tables are to be synchronized or have already been synchronized. You can also deactivate synchronization with Squeeze for individual tables there.

### Checking the Squeeze Master Data

On the Squeeze page, you can check whether all master data tables already exist. If any are missing, a 404 error may occur during the synchronization attempt. This is avoided in the latest app version by subsequently creating the table in Squeeze in case of doubt.

[![image-1749561672224.png](https://docs.squeeze.one/uploads/images/gallery/2025-06/scaled-1680-/image-1749561672224.png)](https://docs.squeeze.one/uploads/images/gallery/2025-06/image-1749561672224.png)

### Checking the setup

#### Squeeze Setup

[![image-1749562273855.png](https://docs.squeeze.one/uploads/images/gallery/2025-06/scaled-1680-/image-1749562273855.png)](https://docs.squeeze.one/uploads/images/gallery/2025-06/image-1749562273855.png)

Does the [Squeeze URL](https://docs.squeeze.one/link/329#bkmrk-api) match? Is the correct squeeze system stored? Check the URL for this.

What is the connection status? Is the tick green? If not, get a current [API key](https://docs.squeeze.one/link/329#bkmrk-get-api-key).

Has the [initial master data upload](https://docs.squeeze.one/link/329#bkmrk-upload-master-data-f) already taken place?

#### Document class Setup

Are the [API settings](https://docs.squeeze.one/link/331#bkmrk-api-setup) of the document class correct? Please check whether the IDs entered match those on the DEXPRO platform.

[![image-1749562319945.png](https://docs.squeeze.one/uploads/images/gallery/2025-06/scaled-1680-/image-1749562319945.png)](https://docs.squeeze.one/uploads/images/gallery/2025-06/image-1749562319945.png)

##### Checking the Documentclass Id

##### [![image-1742550596879.png](https://docs.squeeze.one/uploads/images/gallery/2025-03/scaled-1680-/image-1742550596879.png)](https://docs.squeeze.one/uploads/images/gallery/2025-03/image-1742550596879.png)

#####  

##### Checking the Export Interface id

[![image-1742550837407.png](https://docs.squeeze.one/uploads/images/gallery/2025-03/scaled-1680-/image-1742550837407.png)](https://docs.squeeze.one/uploads/images/gallery/2025-03/image-1742550837407.png)

##### Checking the Line Table id

[![image-1742551047798.png](https://docs.squeeze.one/uploads/images/gallery/2025-03/scaled-1680-/image-1742551047798.png)](https://docs.squeeze.one/uploads/images/gallery/2025-03/image-1742551047798.png)