generate settlement rule while project creation

Hi,

Below is the requirement.

1. We need to automatically generate settlement rule to the WBS without running T-code CJB1 or CJB2.

2. We should not do it through CJ20N edit screen also.

3. The settlement rule has to be generated upon project creation.

Is there any user exit can generate settlement rule for WBS element while project creation?

Please advise.