@Bheemaraju Vagu 

 

Instead of creating catalog client script create onChange client script on SC_Task table.

In script section add below script.

 

function onChange(control, oldValue, newValue, isLoading, isTemplate) {
   if (isLoading || newValue === '') {
      return;
   }
 
if(newValue == '3' && g_form.getValue('cat_item') == 'your item sys_id'){
g_form.setMandatory('variables.manager',true);
}
 
   //Type appropriate comment here, and begin script below
   
}
 

Please Mark my Solution as Accept and Give me thumbs up, if you find it Helpful.

 

Regards,

Vaishnavi Shinde