Stop unearned revenue

Hi,

Our client have a scenario where they have create AR invoice with invoicing rule and accounting rule. But, before the end of accounting rule period, they want to stop the unearned revenue and acknowledge the remaining amount as revenue.

For example:

Invoice amount 12,000 with invoicing rule = in advanced and accounting rule = 12 period.

The journal for period 1:

Dr. Receivable    12,000

Cr. Revenue                       1,000

Cr. Unearned Rev             11,000

period 2:

Dr. Unearned Rev 1,000

Cr. Revenue                        1,000

In period 3, we want to fully claim the remaining revenue

Dr. Unearned Rev 10,000

Cr. Revenue                        10,000

How to achieve that scenario in AR?

Thanks,

Arie