[Solved]Trying to set subtasks as canceled when their parent is set to canceled

Hi! I see several issues with this workflow code: the conditions in the guard function are not sufficient; neither the State field nor the “Canceled” state value are set in the requirements section; “subtask of” needs to be replaced with “parent for”. Please find a revised version below which should address your needs:

const entities = require('@jetbrains/youtrack-scripting-api/entities');

exports.rule = entities.Issue.onChange({
title: 'Cancel child when parent is canceled',
guard: (ctx) => {
  return ctx.issue.isChanged("State") && ctx.issue.links["parent for"] && ctx.issue.becomes("State", "Canceled");
  
},
action: (ctx) => {
  const issue = ctx.issue;
  const cancelChild = function (subtask) {
    subtask.fields.State = ctx.State.Canceled;
  };
  issue.links["parent for"].forEach(cancelChild);
},
requirements: {
  Subtask: {
    type: entities.IssueLinkPrototype,
    name: 'Subtask',
    outward: 'parent for',
    inward: 'subtask of'
  },
  State: {
    type: entities.State.fieldType,
    Canceled: {}
  }
}
});

Feel free to refer to our Developer Portal for more information on workflows API, as well as general advice on composing workflows.

Thank you for your help, it works correctly now.