Reduction of PIR in Strategy 70.

Hi,

My problem is related to PIR reduction. Scenario is as below

Strategy 70, for Assembly, I enter PIR.

Strategy 40, for Final Product. (Sales order received).

I do production of Assembly, and consume it in Final Product order through back flash.

Expectation is, along with 261 movement, PIR of Assembly should reduce - which is not happening.

Surprisingly if I issue the Assembly with mov. 201 to cost center, PIR reduction happens.

Where could be the flaw!

Please advice,

Abir.