Error when PS settlement CJ88 to G/L (urgent)

Hi All,

I have maintain and configure settlement rule for PS. Under project Settlement rule I have enter G/L 122100 (balance sheet) Ful C11 for activity 002 and 003.

During settlement time CJ88, the only come out is NWA 11820158002 0002 WBS P-118PJ20158002-02 and not GL. When I check the message it shown Define a settlement cost element for receiver type G/L. What should I do. I have maintain and not seen any  miss out.

Long text is you have not defined under which cost element the costs/revenues for the sender should be settle to for receiver type G/L and assignment 020.

Please Help