> For the complete documentation index, see [llms.txt](https://doc.sysdevmobile.com/mss-extensibility/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.sysdevmobile.com/mss-extensibility/mss-5.1/functions-kalipso-to-mss/service/ext_service_cancel.md).

# EXT\_Service\_Cancel

Function to ask MSS to cancel a service.

*Input parameters:*

* inServiceExercise – Exercise of the service
* inServiceSeries – Series of the service
* inServiceNumber – Number of the service
* inCancelCode – Cancel code selected by the user

Output parameters:

* outResultCode – 0 – OK / -3 – Error or user canceled