---
title: backwardMigration
framework: swiftdata
role: symbol
role_heading: Type Property
path: swiftdata/swiftdataerror/backwardmigration
---

# backwardMigration

## Declaration

```swift
static let backwardMigration: SwiftDataError
```

## See Also

### Migration errors

- [unknownSchema](swiftdata/swiftdataerror/unknownschema.md)