Hi @vimalchandv: It is not a good practice to call activity from data transform. 

In generic, you can make use of any of these based on your need. "CallActivity" function has a additional feature where you can pass param page (usefull when you work with java) as parameter where as pxexecuteacitivity uses the current parameter page.

Thanks.

Hi @vimalchandv, if you have to just pass the current param page to the calling activity then use pxExecuteAnActivity but if you want to specify another specific param page you should use callActivity.