How can we find out what standard function module/class methods are used in GeniL classes to fetch data and show it in Web UI

Hi Experts,

Please let me know the steps how we can get what standard function modules/class methods are used to fetch data from databases and show it in the Web UI.

for example:-

We know the Genil class for BP is CL_CRM_BUIL. How can we get which function module / class methods are used to get marketing attributes data in CL_CRM_BUIL for a BP.

Kindly describe all the steps properly.