> 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/general/3801-clear-document-lines-1.md).

# 3802 – On Select Document Type

3802 – On Select Document Type

| Event               | Extension action set  | Description                                                                                             |
| ------------------- | --------------------- | ------------------------------------------------------------------------------------------------------- |
| [Before ](#before)  | EXT\_3802\_1\_Before  | Will be executed before MSS validates the selected document type                                        |
| [Replace](#replace) | EXT\_3802\_2\_Replace | Will be executed before MSS validates the selected customer with the possibility to cancel the process; |
| [After](#after)     | EXT\_3802\_3\_After   | Will be executed after MSS validates the selected document type                                         |

### Before

*Input Parameters*

* inDocumentModule – Code of the document module (P – Orders / A – Sales / F – Purchases / E – Suppliers orders) 
* inDocumentType - Code of the selected document type 
* inCustomerCode - Code of the customer, if selected   

### Replace

*Input Parameters*

* inDocumentModule – Code of the document module (P – Orders / A – Sales / F – Purchases / E – Suppliers orders) 
* inDocumentType - Code of the selected document type 
* inCustomerCode - Code of the customer, if selected

*Output Parameters*

* outCanSelect - Return code: 1 – Continue the process / 0 – Cancel; 
* outCustomerToSelect - If configured, returns the customer code to be selected 
* outDeliveryPLaceToSelect - If configured, returns the delivery place code to be selected

### After

*Input Parameters*

* inDocumentModule – Code of the document module (P – Orders / A – Sales / F – Purchases / E – Suppliers orders) 
* inDocumentType - Code of the selected document type 
* inCustomerCode - Code of the customer, if selected