# OH-RallyDev-0056

### Description

When the user encounters an error **OH-RallyDev-0056**, then the following error message will appear:

OH-RallyDev-0056: Changes field does not have data in required format. This field requires an advanced mapping. Verify whether a desired advanced mapping is configured for this field or not. Refer to the product guide for the connector Rally for details.

### Cause

* Changes field does not have required advanced mapping.

### Solution

* Refer to [Map Changes field for Change Set](https://docs.opshub.com/v7.216/connectors/rally#map-changes-field-for-change-set)