Past status of Internal Order at running Result Analysis

Dear Gurus

I created Internal order and set its status as REL on Jan.

I changed its status as TECO on Feb.

I didn't post WIP on Jan.

I run result analysis KKA1 with "Period:Jan" on Feb.

But it didn't post WIP.

Instead, it posts Cost of Sales.

So, it seems the Result Analysis doesn't care about past status

of Internal Order, even though I set past period on selection screen.

It cares only current status.

Am I correct? Or is this customizing issue?

Y.Kaneko