> For the complete documentation index, see [llms.txt](https://developers.portos.sk/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers.portos.sk/validation-constraints.md).

# Validation constraints

List of validation constraints that are specified in `code` property of [`PortosValidationProblemDetailsError`](/error-models.md#portosvalidationproblemdetailserror).

## 1 - Required

Property is required, but was not specified.

## 2 - Unique

Property value must be unique.