Multi period Accounting - skips the last month recognition journal

Dear Guru's

We have defined the Multi Period Accounting feature, which is newly added in SLA, for automatically creating the Recognition journals.

We have given the Proration type as "First Period" to get the evenly calculated recognition journals.

while recording a Standard Invoice. In deffered period we have given,6 periods, for the amount 6000. but system is calculating 1200 PM, as a recognition journals. it is skipping the last period.

Can anybody,suggest me, in this regards.

Thanks in Advance.

D.Vignesh.