Transaction KBS in OBYC

Hello to everyone,

I am changing the old general accounting plan for the new general accounting plan in a company.

Then in the transaction OBYC there are transaction KBS where i need to change one account , 765000 and add the new one 606000.

But it hasn´t got the flag account determination, and i dont know where can i change it. I know that it is the place to change the account cos when i Display a document ( FI document ) i select the layout with transaction and appear KBS with the account 765000.

Anyone can help me??

Many thanx