When I use additional VS UUID, should I...

Question

When I use additional VS UUID, should I use sd_ble_uuid_vs_add(), se_ble_gatts_service_add() in order?
example,
sd_ble_uuid_vs_add(); <- VS1 UUID 
 se_ble_gatts_service_add(); <- Service1 related to VS1 
 se_ble_gatts_service_add(); <- Service2 related to VS1 
 sd_ble_uuid_vs_add(); <- VS2 UUID 
 se_ble_gatts_service_add(); <- Service3 related to VS2 
 se_ble_gatts_service_add(); <- Service4 related to VS2 
 otherwise,
Can I add VS UUIDs first and then add services?
example, 
 sd_ble_uuid_vs_add(); <- VS1 UUID 
 sd_ble_uuid_vs_add(); <- VS2 UUID 
 se_ble_gatts_service_add(); <- Service1 related to VS1 
 se_ble_gatts_service_add(); <- Service2 related to VS1 
 se_ble_gatts_service_add(); <- Service3 related to VS2 
 se_ble_gatts_service_add(); <- Service4 related to VS2 
 it assume that configuration below is done.
p_ble_enable_params->common_enable_params.vs_uuid_count = 2;
in softdevice_enable_get_default_config()

FormerMember · Accepted Answer

Yes, you can add the UUIDs first and then add the services. 
 The output parameter of sd_ble_uuid_vs_add() , p_uuid_type, is the reference to the added UUID. For how to refer to an added UUID when adding a service to it, see the example ble_app_uart --> function ble_nus_init(). 
 Update 30.01.2017: It is no problem to first add two UUIDs and then add the first UUID to a service: