Have a different Forex loss gain account

Hello  All ,

I need to post to different loss and gain account depending on the GL , presently we have one account for Loss and gain

and one for Valuation loss and gain ,

But for few other GLs we need system to book the loss and gain to another GL and Valuation loss and gain to another

OB09 Config

AS IS

JPY

Example            Realized                   Valuation

GL 111111  --->  Loss   8888888           7777777

                         Gain   8888888           6666666

Bal Adjust                                           3333333 

CHF

GL 222222  --->  Loss   8888888           7777777

                         Gain   8888888           6666666

Bal Adjus                                            4444444 

Our To Be is as below

TO BE --- for Currency CHF
CHF

GL 222222  --->  Loss   5555555           6666666

                         Gain   5555555           6666666

Bal Adjust                                           4444444 

System presently  is going to OBA1 tcode and picks up the same  Exp gain and Expense account  which is presently maintained

OBA1--> KDB 

Exp Account   E/R gain account
8888888           8888888

How to handle this case with the help of  OBA1 and OB09 tcode  ???

Thanks

Aryan