SD- Billing

On saving SD billing document the following entry is generated:

Cutomer Dr

Sales Revenue Cr.

Suppose Sales Revenue amount goes in G/L 31100240 & Dr amt goes in 23100240.

Now, Sales Revenue shd go to G/L 31100240- this we maintain in Revenue Account Determinationu2192u201CAssign G/L Accountu201D. But where do we maintain that Dr entry shd go to G/L a/c 23100240?