While going thru "Financial Setups" of "Payables Module"; Inventory Organization field needs to be filled, as in yellow. However I haven't come across yet, creation of Inventory Organization in your tutorial. So either I have to enter one or make the field "not mandatory" under Supplier-Purchasing tab.
Could you please tell me how I may proceed your tutorial for this particular issue ? I am practicing in Vision Instance of R12. Thanks.

This is because you are using Vision demo as oppose to Prod installation. Inventory Org field is mandatory if Purchasing is in use.
This thread will help you in resolving this issue:


http://handsonerp.com/forum?func=view&id=824&catid=2#824

Hi Hasan :

Thanks, but greatly appreciate if you could please come up with a tutorial on this section; as lot of accounting information to be filled and understanding about role each plays, would definitely help. Thanks.

I have not created a video on this because I do not recommend you using Vision database. This is one problem you are facing. Tons will come later on specially in Assets implementation. Vision installation comes with some pre-configured settings that will affect your learning. It is important for a new comer to practice on a Production (non-Vision) installation so that one could learn how to implement Financials from scratch.
Nevertheless, It is pretty easy to create a dummy organization. Simply fill out the accounting fields with any values. If you are experiencing any issue, post your question and I will try to help you out.