MAX Date Dependent On Quantity

I am trying to query only the Max date dependant on quantity

Create Table dbo.TestParts
(Part char(30), Desc1 char(50), Desc2 char(50));
Create Table dbo.TestStructure
(Model char(30), Part char(30), EDATE smalldatetime, QtyPer float);
GO
Insert INTO dbo.TestParts Values('101111','Widget A', 'Batteries Not Included'),

[Code] ....

Looking for a return of:

PART Description EDATE QtyPer
101112 Widget B ..... 2012-12-03 3
101113 Widget C ..... 2012-12-03 5
101114 Widget D ..... 2012-12-01 1

Widget A should not show because the last date the qty was changed to Zero

Closest that I have come..........(which is pulling the part 101111 which should be incorrect)

Select ts.Part, RTRIM(tp.Desc1) + ' ' + RTRIM(tp.Desc2) as Description,
ts.EDATE, ts.QtyPer
FROM testing.dbo.TestStructure ts
Inner Join (Select Part,MAX(EDATE) as Date
FROM testing.dbo.TestStructure
WHERE QTYPER <> '0'

[Code] .....