S.agrements qnty issue

Dear SD Experts,

I am facing one issue in the scheduling agrrement.

My document type is LZ, Item category LZN.

I have created on Agreement document in VA31 for 20 qnty

Ex : 15.05.2015----10 Qnty

        25.05.2015----10 qnty

Now in VL01N,I gave 15.05.2015, Here normally system will fetch only 10 qnty since on 15th 10 qnty I mentioned in the agreement.

But in my case system is fetching all 20 qnty and I able to PGI.

In VL10A also system is showing correct date wise qnty.

But not able to process for background

Here also in the background system is fetching full qnty irrespective date.

Screen shot

In the delivery

Confused on this, same like vl10a, vl10c also facking same issue.

Partial delivery allowed only in the customer master.

please help me on this issue.