change in Vehicle resource/MOT triggering subcontracting status

A Technical question :

Whenever I am changing Vehicle resource/MOT ,it is triggering subcontracting status and changing it from sent to carrier assigned . When I am changing vehicle resource , it automatically identify and change MOT .

I am wondering where is the code is written which trigger it .

I found 2 action on TOR level in /BOBF/Conf_UI

Action 1 - ASSIGN_VEHICLE_RES ---- This will assign vehicle resources

Action 2 - SET_SUBC_STATUS_TSP_ASSIGNED - this set subcontracting status to carrier assigned

When I went through code of action 1 , I did not find code which is calling Action 2 .

I am wondering how action 1 triggers action 2 . Where is the code .

Thanks for your help .

Regards,

Message was edited by: Michael Appleby