Getting Ambiguous Column Name Error and not sure why

[dwg23]

I am running the below statement and getting The following error and am not sure why.
Ambiguous column name 'item'.

select dci.item, dci.scheduleID, dci.customer, c.name, vw.invoicedate
from tblsoDiscountCustomerItem as dci inner join tblarCustomer as c on dci.customer = c.customer
JOIN vwsninvoicelinesales vw ON vw.customer = c.customer
order by item

Thanks.
dwg23

 

[dwg23]

Figured it out. the error was coming from the order by item. It should have been order by dci.item
Thanks All!