> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cognite.com/llms.txt
> Use this file to discover all available pages before exploring further.

# ReverseConnectionTargetMissing validation rule

> Validates that the direct connection property referenced by a reverse connection has a value type specified. Recommends explicit target view for clarity.

This rule checks whether the direct connection property (referenced by reverse connection) has a value type.

## Why it matters

While CDF allows value type `None` as a search optimization for multi-value relations,
it's better to explicitly specify the target view for clarity and maintainability.

## Example

If `WindTurbine.windFarm` has value type `None` instead of `WindFarm`,
this validator recommends specifying `WindFarm` explicitly.

## Further reading

* [Validation rules](/cdf/deploy/neat/validation/index)