> 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/3800-select-document-customer.md).

# 3800 - Select Document Customer

3800 - Select Document Customer

| Event   | Extension action set  | Description                                                                                             |
| ------- | --------------------- | ------------------------------------------------------------------------------------------------------- |
| Before  | EXT\_3800\_1\_Before  | Will be executed before MSS validates the selected customer;                                            |
| Replace | EXT\_3800\_2\_Replace | Will be executed before MSS validates the selected customer with the possibility to cancel the process; |
| After   | EXT\_3800\_3\_After   | Will be executed after MSS validates the selected customer;                                             |

*Input Parameters (event before):*

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

*Input Parameters* *(event replace):*

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

*Output Parameters (event replace):*

* outCanSelect – Return code: 1 – Continue the process / 0 – Cancel;

*Input Parameters (event after):*

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