Can a subquery hosted within a table reference that hosting table?

Question

I have a large table that tracks Orders and Deliveries ("OrderAssign"). The OrderID column has a dropdown with a query that references some other tables that cover order details, like when each Order is due.
I'd like the dropdown query to only display order details for Orders that haven't been filled ("OrderAssign.Filled = 0"). The problem, I think, is that this would mean the query would reference the table that hosts it. Is this possible? I tried
to set up a test case, and got a generic syntax error I've seen many times before when the syntax is correct, but I'm using a SQL structure that Access doesn't like. 
This table is linked to SQL, so I could also write a SQL view or function if that makes a difference.
I'm using Access 2010. Thanks!
EDIT: Huh, so I figured out a way, I think. I created a SQL view that filtered the records the way I wanted; then used the Linked Table Manager to create a linked view; then used that linked view in my dropdown subquery.
So I guess my follow up question to this is: is there any reason I SHOULDN'T do this? Will there be any issues with existing records in the table whose values will no longer show up in the constraining dropdown subquery?
EDIT 2: And I think I found the deal breaker. The field doesn't display the first column with the "real" info, the ID#. It displays the second. Once you add a query that doesn't display every row in the table, that query no longer has results to
display for the filtered records. So some of the records display the "real" info, which the users don't want to see, and the open records show the second field. Messy.
hydrogonium

Answer 1

I might not be using the right terminology. I have a lot of experience with SQL Server, relatively little with Access. I am doing this for a client who is used to entering data directly into the table, and wants minimal changes. However, the dropdown literally
has thousands of entries, which could be pruned by ~80% if filled orders are filtered out.
The table has "dropdown subqueries" (probably not the right term), which were created like so:
- Go to the Design tab.
- Click on the field you want to modify.
- Go to the lookup tab.
- Change the Display Control to 'Combo Box'
- Change the Row Source to a query, in my case, 'SELECT * FROM LinkedSQLView'
- Format the list as you want it displayed; in my case, the actual ID# is hidden in the first column, and the other ten columns are displayed.
The fields in question are:
- OrderRequestID (Number on Access / Int on SQL Server) - has a dropdown.
- OrderFillID (Number on Access / Int on SQL Server) - has a dropdown.
- OrderFilled (Yes/No on Access / Bit on SQL Server).
Purpose / Background: This table is basically a clearinghouse for entities making orders and other entities filling them. My client sits in the middle and matches everything up. It can get very complicated, because different products qualify for different
orders, and the amount supplied can be smaller or greater than an individual order.
hydrogonium