how to make a logical exclusion within the query? - sql-server-2008-r2

Question

I have 3 tables in our ERP database holding all delivery data (table documents holds one row for each delivery note, documentpos holds all positions on delivery notes, documentserialnumbers holds all serial numbers for delivered items).
I want to show all items with their serial number that have been delivered to the customer and still resides there so far.
The above shown output of the following query however shows, that one item that has been delivered was returned (red marks) later. The return delivery note has the document number 527419 (dark red mark) and refers to the the delivery note 319821 (green) which is listed yellow.
The correct list would consequential show only items that are still on customer's site without the returned items (see below).
How do I have to change the query in order to exclude the returned items from the output?
The upper table shows in the image shows the output of my query, the table below how it should be.
select a.BelID, c.ReferenzBelID, a.itemnumber, a.itemname, c.deliverynotenumber,c.documenttype, c.documentmark, b.serialnumber
from dbo.documentpos a
inner join dbo.documentserialnumbers b on a.BelPosID = b.BelPosID
inner join dbo.documents c on a.BelID = c.BelID
inner join sysdba.customers d on d.account = c.A0Name1
where d.AccountID = 'customername' and c.documenttype like '%delivery%'
order by a.BelID

Answer 1

You may exclude positions, which are referenced by any "return" delivery note, like this (edited)
select a.BelID, c.ReferenzBelID, a.itemnumber, a.itemname, c.deliverynotenumber,c.documenttype, c.documentmark, b.serialnumber
from dbo.documentpos a
inner join dbo.documentserialnumbers b on a.BelPosID = b.BelPosID
inner join dbo.documents c on a.BelID = c.BelID
inner join sysdba.customers d on d.account = c.A0Name1
where d.AccountID = 'customername' and c.documenttype like '%delivery%'
and not exists (select 1
from dbo.documents cc
where cc.documenttype like '%delivery%'
and c.ReferenzBelID=cc.BelID
and c.documentmark='VLR')
and not exists (select 1
from dbo.documents ccc
join dbo.documentpos aa on aa.BelID = ccc.BelID
where ccc.ReferenzBelID=c.BelID
and ccc.documentmark='VLR'
and a.itemnumber=aa.itemnumber)
order by a.BelID