VMI: reduce Stock in transit - what is the correct method?

Question

Hi Gurus,
We are using APO/SCM  system to implement VMI functionality to replenish stock at customer location.  We need to build stock in transit at customer location after PGI happens in ECC.  
Now, stock in transit is show up in 'Stock in transit' key figure, but the question is how to reduce stock in transit once it is received at customer location.
SAP recommends following four methods to reduce:
http://help.sap.com/saphelp_scm2007/helpdata/en/f1/f69a3dcbcfac53e10000000a114084/frameset.htm
1.  Goods receipt information is not sent from the customer to the vendor
2. The open purchase order quantity is sent from the customer to the vendor
3. A proof of delivery is sent from the customer
4.  The stock in transit quantity is sent from the customer to the vendor
Out of these 1 and 2 methods are feasible in our scenario.
Please share your experience if you have used any of these methods, I want to hear from someone who implemented any of these methods before deciding on a method.
Thanks in advance,
Niranjan

Answer 1

After research and testing  I found second method  looks good to me. I tested in our test system, this works pretty much they way it is described in the help (link in above message) .  The issue is resolved.