PMPro and Set Expiration Date plugin

Same here:

Installed the PMPro Set Expiration Date add on that stated “This expiration date will override any expiration period set on the level” but it doesn’t happens.

I assumed that if an existing user renews its subscription, the new ending subscription is what I set on Expiration date, instead the date is one year longer than the original ending.

I use the Woocommerce add on to sell subscriptions and it works well, but the new ending date is simply ignored.

The case: user that is already member, subscription ends on 2015/04/30 , the subscription duration is set on one year (as suggested on PMPRO level panel) and the Expiration date is set on 2016/01/31 .
I presume that when a user renews, the new subscription ending will be 2016/01/31 disregarding the previous ending, instead the new ending is 2016/04/30 (one year longer).

Is this the way that this expiration date add on works? because if yes, it’s completely useless, so I suspect there is a bug or in this add on or between connection with Woocommerce add on.

Could you, please take a look on this and, hopefully solve or say me where I wrong?

Thanks in advance

Mac