> 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-mss-to-kalipso/services/2421-services-new-start-intervention.md).

# 2421 - New / Start intervention

2421 - New / Start intervention

<table data-header-hidden><thead><tr><th width="175.33333333333331">Event</th><th width="224">Extension action set</th><th>Description</th></tr></thead><tbody><tr><td>Event</td><td>Extension action set</td><td>Description</td></tr><tr><td><a href="#before">Before </a></td><td>EXT_2421_1_Before</td><td>Will be executed before MSS starts a new intervention or press + button to create a new one;</td></tr><tr><td><a href="#replace">Replace</a></td><td>EXT_2421_2_Replace</td><td>Will replace MSS start or create a new intervention code, can be used also to create validations before MSS run the default code on the start of a new intervention using the output parameter outRunMSSCode;</td></tr><tr><td><a href="#after">After</a></td><td>EXT_2421_3_After</td><td>Will be executed after MSS runs the Start intervention code or after close the new intervention screen;</td></tr></tbody></table>

### Before

*Input Parameters*

* inServiceExercise – Exercise of the service (SITEXR);&#x20;
* inServiceSeries – Serie of the service (SITSER);&#x20;
* inServiceNumber – Number of the service (SITNDC);&#x20;
* inEquipmentLine – Line number of equipment (SITLEQ);

### Replace

*Input Parameters*

* inServiceExercise – Exercise of the service (SITEXR);&#x20;
* inServiceSeries – Serie of the service (SITSER);&#x20;
* inServiceNumber – Number of the service (SITNDC);&#x20;
* inEquipmentLine – Line number of equipment (SITLEQ);

*Output Parameters*

* outRunMSSCode – when replacing MSS module must return 0(zero), if working as validations can return 1 so MSS opens the Service, 0 to ignore MSS code or -1 to abort the operation;
* outNewInterventionLine – Number of the new intervention when replacing MSS code;

### After

*Input Parameters*

* inServiceExercise – Exercise of the service (SITEXR);&#x20;
* inServiceSeries – Serie of the service (SITSER);&#x20;
* inServiceNumber – Number of the service (SITNDC);&#x20;
* inInterventionLine – Line number of intervention (SITLIN);&#x20;
* inEquipmentLine – Line number of equipment (SITLEQ);


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