When an electrical designer wants to schedule parameters from Generic Annotations, the correct method is to use a Note Block, not a generic schedule. Revit documentation defines this process clearly under Annotation Schedules (Note Blocks):

''Annotation schedules, or note blocks, list all instances of annotations that you can add using the Symbol tool.'' ''Creating an Annotation Schedule (Note Block):

Load the generic annotation family or families into your project and place them where desired.

Click View tab Create panel Schedules drop-down Note Block.

In the New Note Block dialog, for Family, select a generic annotation.''

This extract confirms that when working with generic annotation families, Revit requires the use of a Note Block to extract and list their parameters in a schedule. Standard schedules such as Generic Model or Family schedules cannot access data from Generic Annotations since they are annotation-based, not model-based.