> 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/customer/ext_customer_select.md).

# EXT\_Customer\_Select

Function to ask MSS to open the customer selection screen.

*Input parameters*:

* inRouteCode – Code of the selected route to filter when Customer from route is active;
* inSubRouteCode – Code of the selected sub route to filter when Customer from route is active;

*Output parameters*:

* outResultCode – Return code: 0 – Done / < 0 User canceled selection;
* outSelectedCustomer – When outResultCode = 0 gets the code of the selected customer;
* outSelectedCustomerName – When outResultCode = 0 gets the name of the selected customer;