> ## Documentation Index > Fetch the complete documentation index at: https://docs.eorion.com/llms.txt > Use this file to discover all available pages before exploring further. # 修改流程实例执行状态 > Submits a list of modification instructions to change a process instance's execution state. A modification instruction is one of the following: * Starting execution before an activity * Starting execution after an activity on its single outgoing sequence flow * Starting execution on a specific sequence flow * Canceling an activity instance, transition instance, or all instances (activity or transition) for an activity Instructions are executed immediately and in the order they are provided in this request's body. Variables can be provided with every starting instruction. The exact semantics of modification can be read about in the [User guide](https://docs.camunda.org/manual/develop/user-guide/process-engine/process-instance-modification/). ## OpenAPI ````yaml POST /process-instance/{id}/modification openapi: 3.0.2 info: title: ORION Platform REST API description: OpenApi Spec for ORION Camunda Platform REST API. version: 7.22.6-ee license: name: Apache License 2.0 url: http://www.apache.org/licenses/LICENSE-2.0.html servers: - url: http://{host}:{port}/{contextPath} description: The API server for the default process engine variables: host: default: localhost port: default: '8080' contextPath: default: engine-rest - url: http://{host}:{port}/{contextPath}/engine/{engineName} description: The API server for a named process engine variables: host: default: localhost port: default: '8080' contextPath: default: engine-rest engineName: default: default - url: '{url}' description: The API server with a custom url variables: url: default: '' security: - basicAuth: [] tags: - name: Authorization - name: Batch - name: Condition - name: Decision Definition - name: Decision Requirements Definition - name: Deployment - name: Engine - name: Event Subscription - name: Execution - name: External Task - name: Filter - name: Group - name: Historic Activity Instance - name: Historic Batch - name: Historic Decision Definition - name: Historic Decision Instance - name: Historic Decision Requirements Definition - name: Historic Detail - name: Historic External Task Log - name: Historic Identity Link Log - name: Historic Incident - name: Historic Job Log - name: Historic Process Definition - name: Historic Process Instance - name: Historic Task Instance - name: Historic User Operation Log - name: Historic Variable Instance - name: History Cleanup - name: Identity - name: Incident - name: Job - name: Job Definition - name: Message - name: Metrics - name: Migration - name: Modification - name: Process Definition - name: Process Instance - name: Signal - name: Schema Log - name: Task - name: Task Attachment - name: Task Comment - name: Task Identity Link - name: Task Local Variable - name: Task Variable - name: Telemetry - name: Tenant - name: User - name: Variable Instance - name: Version externalDocs: description: Find out more about ORION Rest API url: https://docs.eorion.com paths: /process-instance/{id}/modification: post: tags: - Process Instance summary: Modify Process Instance Execution State description: >- Submits a list of modification instructions to change a process instance's execution state. A modification instruction is one of the following: * Starting execution before an activity * Starting execution after an activity on its single outgoing sequence flow * Starting execution on a specific sequence flow * Canceling an activity instance, transition instance, or all instances (activity or transition) for an activity Instructions are executed immediately and in the order they are provided in this request's body. Variables can be provided with every starting instruction. The exact semantics of modification can be read about in the [User guide](https://docs.camunda.org/manual/develop/user-guide/process-engine/process-instance-modification/). operationId: modifyProcessInstance parameters: - name: id in: path schema: type: string required: true description: The id of the process instance to modify. requestBody: content: application/json: schema: $ref: '#/components/schemas/ProcessInstanceModificationDto' examples: example-1: summary: POST `/process-instance/aProcessInstanceId/modification` value: skipCustomListeners: true skipIoMappings: true instructions: - type: startBeforeActivity activityId: activityId variables: var: value: aVariableValue local: false type: String varLocal: value: anotherVariableValue local: true type: String - type: cancel activityInstanceId: anActivityInstanceId annotation: Modified to resolve an error. responses: '204': description: Request successful. '400': content: application/json: schema: $ref: '#/components/schemas/ExceptionDto' description: At least one modification instruction misses required parameters. '500': content: application/json: schema: $ref: '#/components/schemas/ExceptionDto' description: >- The modification cannot be performed, for example because it starts a failing activity. components: schemas: ProcessInstanceModificationDto: type: object properties: skipCustomListeners: type: boolean nullable: true description: >- Skip execution listener invocation for activities that are started or ended as part of this request. skipIoMappings: type: boolean nullable: true description: >- Skip execution of [input/output variable mappings](https://docs.camunda.org/manual/7.22/user-guide/process-engine/variables/#input-output-variable-mapping) for activities that are started or ended as part of this request. instructions: type: array nullable: true items: $ref: '#/components/schemas/ProcessInstanceModificationInstructionDto' description: >- JSON array of modification instructions. The instructions are executed in the order they are in. annotation: type: string nullable: true description: An arbitrary text annotation set by a user for auditing reasons. ExceptionDto: title: ExceptionDto type: object properties: type: type: string nullable: true description: An exception class indicating the occurred error. message: type: string nullable: true description: A detailed message of the error. code: type: number description: >- The code allows your client application to identify the error in an automated fashion. You can look up the meaning of all built-in codes and learn how to add custom codes in the [User Guide](https://docs.camunda.org/manual/7.22/user-guide/process-engine/error-handling/#exception-codes). ProcessInstanceModificationInstructionDto: type: object required: - type properties: type: type: string enum: - cancel - startBeforeActivity - startAfterActivity - startTransition description: >- **Mandatory**. One of the following values: `cancel`, `startBeforeActivity`, `startAfterActivity`, `startTransition`. * A cancel instruction requests cancellation of a single activity instance or all instances of one activity. * A startBeforeActivity instruction requests to enter a given activity. * A startAfterActivity instruction requests to execute the single outgoing sequence flow of a given activity. * A startTransition instruction requests to execute a specific sequence flow. variables: $ref: '#/components/schemas/TriggerVariableValueDto' activityId: type: string nullable: true description: >- Can be used with instructions of types `startTransition`. Specifies the sequence flow to start. transitionId: type: string nullable: true description: >- Can be used with instructions of types `startTransition`. Specifies the sequence flow to start. activityInstanceId: type: string nullable: true description: >- Can be used with instructions of type `cancel`. Specifies the activity instance to cancel. Valid values are the activity instance IDs supplied by the [Get Activity Instance request](https://docs.camunda.org/manual/7.22/reference/rest/process-instance/get-activity-instances/). transitionInstanceId: type: string nullable: true description: >- Can be used with instructions of type `cancel`. Specifies the transition instance to cancel. Valid values are the transition instance IDs supplied by the [Get Activity Instance request](https://docs.camunda.org/manual/7.22/reference/rest/process-instance/get-activity-instances/). ancestorActivityInstanceId: type: string nullable: true description: >- Can be used with instructions of type `startBeforeActivity`, `startAfterActivity`, and `startTransition`. Valid values are the activity instance IDs supplied by the Get Activity Instance request. If there are multiple parent activity instances of the targeted activity, this specifies the ancestor scope in which hierarchy the activity/transition is to be instantiated. Example: When there are two instances of a subprocess and an activity contained in the subprocess is to be started, this parameter allows to specifiy under which subprocess instance the activity should be started. cancelCurrentActiveActivityInstances: type: boolean nullable: true description: >- Can be used with instructions of type cancel. Prevents the deletion of new created activity instances. TriggerVariableValueDto: allOf: - type: object properties: local: type: boolean nullable: true description: >- Indicates whether the variable should be a local variable or not. If set to true, the variable becomes a local variable of the execution entering the target activity. - $ref: '#/components/schemas/VariableValueDto' VariableValueDto: type: object properties: value: $ref: '#/components/schemas/AnyValue' type: type: string nullable: true description: The value type of the variable. valueInfo: type: object additionalProperties: true description: >- A JSON object containing additional, value-type-dependent properties. For serialized variables of type Object, the following properties can be provided: * `objectTypeName`: A string representation of the object's type name. * `serializationDataFormat`: The serialization format used to store the variable. For serialized variables of type File, the following properties can be provided: * `filename`: The name of the file. This is not the variable name but the name that will be used when downloading the file again. * `mimetype`: The MIME type of the file that is being uploaded. * `encoding`: The encoding of the file that is being uploaded. The following property can be provided for all value types: * `transient`: Indicates whether the variable should be transient or not. See [documentation](https://docs.camunda.org/manual/7.22/user-guide/process-engine/variables#transient-variables) for more informations. (Not applicable for `decision-definition`, ` /process-instance/variables-async`, and `/migration/executeAsync` endpoints) AnyValue: description: |- Can be any value - string, number, boolean, array or object. **Note**: Not every endpoint supports every type. securitySchemes: basicAuth: type: http scheme: basic ````