Settlement overview while creating activity

Hi Experts

When ever i create an activity for a WBS element, the system takes to the screen 'Maintain settlement rule: Overview' and gives a message 'Maintain settlement rule / distribution rule'

The overview already contains the distribution rule : WBS - Receiver WBS element, 100%, settlement type FUL and No.1

I have maintained the standard strategy 01 for the Network type+plant parameters.

What would be the reason for populating the settlement rule overview?

warm regards

ramSiva