From 142e5f5cfb19a984487742a50794073fb5fc7ac7 Mon Sep 17 00:00:00 2001
From: verena <9377970+vpchung@users.noreply.github.com>
Date: Wed, 25 Oct 2023 22:55:40 +0000
Subject: [PATCH] accept NULL as possible value

---
 .../src/components/schemas/ChallengeOperation.yaml               | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libs/openchallenges/api-description/src/components/schemas/ChallengeOperation.yaml b/libs/openchallenges/api-description/src/components/schemas/ChallengeOperation.yaml
index 3455e9a0ad..e5ccb7444d 100644
--- a/libs/openchallenges/api-description/src/components/schemas/ChallengeOperation.yaml
+++ b/libs/openchallenges/api-description/src/components/schemas/ChallengeOperation.yaml
@@ -2,4 +2,5 @@ description: The EDAM operation class of the challenge.
 type: string
 maxLength: 16
 pattern: '^$|^operation_\d+$'
+nullable: true
 example: operation_0004