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

# List compatible fields for a Pair and function

> Requires the GV.APIReader application role, or a higher role (Owner > Contributor > Reader).

API · Dataset Pairs

GET `/api/v1/dataset-pairs/{datasetPairUuid}/validation-capabilities/{functionCode}/fields`

Requires the GV.APIReader application role, or a higher role (Owner > Contributor > Reader).

Operation ID · list\_dataset\_pair\_validation\_compatible\_fields

## Request example

```bash theme={null}
curl --request GET \
  --url 'https://api.generalvalidation.com/api/v1/dataset-pairs/88888888-8888-4888-8888-888888888888/validation-capabilities/COUNT_ROWS/fields?limit=50&sourceField=order_id&sourceCollectionPath=example' \
  --header 'Accept: application/json' \
  --header 'Authorization: Bearer <access-token>'
```

## Authentication and access

* **Required role:** GV.APIReader
* **Data classification:** metadata
* **Side effects:** none

Use an authentication scheme declared below. Ordinary workloads use application tokens; signed-in users use delegated tokens and Organization membership. Activation and invitation acceptance require a person, and execution callbacks require their registered identity.

* Microsoft Entra delegated user token
* Microsoft Entra application token

## Parameters

### datasetPairUuid

path Required

Opaque Dataset Pair UUID.

`string (uuid)`

Opaque Dataset Pair UUID.

### functionCode

path Required

Exact, case-sensitive public validation function code.

**Schema ValidationFunctionCode**

`string`

Exact, case-sensitive public validation function code.

* **Allowed values:** `"COUNT_ROWS"`,`"COUNT"`,`"COUNT_DISTINCT"`,`"MIN"`,`"MAX"`,`"AVG"`,`"SUM"`,`"VALUE"`,`"OUTER_VALUE"`,`"SET_A_IN_B"`,`"SET_B_IN_A"`,`"SET_A_EQUALS_B"`

### limit

query

`integer`

* **Default:** `50`

minimum: 1 · maximum: 100

### cursor

query

`string | null`

Any of

**Option 1: string**

`string`

maximum length: 2048

**Option 2: null**

`null`

### sourceField

query

Exact source field path used to bound compatible target discovery.

`string | null`

Exact source field path used to bound compatible target discovery.

Any of

**Option 1: string**

`string`

minimum length: 1 · maximum length: 1024

**Option 2: null**

`null`

### sourceCollectionPath

query

Exact source collection path; omit for a root field.

`string | null`

Exact source collection path; omit for a root field.

Any of

**Option 1: string**

`string`

minimum length: 1 · maximum length: 1024

**Option 2: null**

`null`

## Responses

This guide summarizes response status codes and headers. Retrieve the deployed, authenticated OpenAPI document for the exact response body schemas and examples. The API also provides an authenticated Swagger UI; opening it in a browser does not automatically attach a bearer token.

Error responses use `application/problem+json`. The response's stable `code` and `type` map to the [error-code reference](/errors).

### 200

Successful Response

### 401

A valid Microsoft Entra bearer token is required.

### 403

The authenticated principal does not have the required role.

### 404

The resource does not exist in this tenant.

### 422

The request is syntactically valid but semantically invalid.

### 429

The bounded application request rate was exceeded.

#### Headers

* **Retry-After:** Seconds to wait before retrying. `integer`minimum: 1

### 503

A required dependency is temporarily unavailable.

#### Headers

* **Retry-After:** Seconds to wait before retrying. `integer`minimum: 1