Limiting View To Distinct Records

I am creating a view using two tables.

TableA
ID
CUST_ORDER_ID
NOTES

TableB
ID
CUST_ORDER_ID
LINE_NO
PART_ID

The new view select statement is:
SELECT dbo.TableA.ID, dbo.TableA.CUST_ORDER_ID, dbo.TableA.NOTES, dbo.TableB.LINE_NO, dbo.TableB.PART_ID
FROM dbo.TableA INNER JOIN dbo.TableB ON dbo.TableA.CUST_ORDER_ID = dbo.TableB.CUST_ORDER_ID

Sometimes TableB will contain multiple lines for the same CUST_ORDER_ID so my view will sometimes return multiple lines. I would like to change it to only return the first line that it finds. I'm pretty sure that I need to use a DISTINCT statement somewhere in there, but am not finding the right syntax. Any suggestions?

Thanks in advance,
Sheldon

select a.cust_order_id,
a.notes,
b.line_no,
b.part_id
from tableA as a inner join (select distinct cust_order_id, line_no, part_id from tableB) as b
on a.cust_order_id = b.cust_order_id

i think this is one of the solution.
best regards
Tonny