Required new Spl G/L indicator in posting key 19 for F-02.

Hi Guru,

we required posting of Retention with splecial G/L indicator in posting key 19 in trnasaction F-02.

Can any body guide me , where i craete spl G/L indicator , wht t.code and SPRO path.

for exm , In my system spl G/L indicator is A (for down paymenst, B for bill of excanhge) , i wants craete C for Retention, and linked with new G/L code. plz u guide me where i create Spl G/L indicator and how to link with new G/L code.

Thnks,

Rahman