> 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-5.0/untitled-1/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 – If not empty MSS will cancel the document with this motive code, otherwise will open MSS cancel motive selection window;

Output parameters:

* outResultCode – Return code: 0 – Done / < 0 User canceled selection or error occurred;