Syntax error converting datetime from character string

I'll show you the entire query to clear things up for you

SELECT yourquery.*,FirstInvoiceDate FROM
	(select 
jobheader.jobno,
costing.dbo.revenue.docketdate,
companyname,
jobdesc,
jobheader.status,
costing.dbo.revenue.value,
orderheader.completedate,
salesperson,
Case	when 'firstinvoicedate' = dateadd(month,14,getdate()) then 'old work' else 'mew work' end as ' '
from jobheader
inner join orderheader on jobheader.orderno = orderheader.orderno
inner join customers.dbo.company on orderheader.customer = customers.dbo.company.coid
inner join costing.dbo.revenue on jobheader.jobno = costing.dbo.revenue.jobno
INNER join customers.dbo.lookupdesignation on customers.dbo.company.designation = customers.dbo.lookupdesignation.ldcode
where costing.dbo.revenue.docketdate is not null ) yourquery
INNER JOIN
	(SELECT CompanyName,Min(docketdate) AS FirstInvoiceDate
	FROM
		(select 
jobheader.jobno,
costing.dbo.revenue.docketdate,
companyname,
jobdesc,
jobheader.status,
costing.dbo.revenue.value,
orderheader.completedate,
salesperson,
Case when firstinvoicedate = dateadd(month,-14,getdate()) then 'new work' else 'rolling work' end as 'Work Status'
from jobheader
inner join orderheader on jobheader.orderno = orderheader.orderno
inner join customers.dbo.company on orderheader.customer = customers.dbo.company.coid
inner join costing.dbo.revenue on jobheader.jobno = costing.dbo.revenue.jobno
INNER join customers.dbo.lookupdesignation on customers.dbo.company.designation = customers.dbo.lookupdesignation.ldcode
where costing.dbo.revenue.docketdate is not null ) yourquery
	GROUP BY CompanyName) latest
ON
yourquery.CompanyName=latest.CompanyName

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>I'll show you the entire query to clear things up for you
My comment is already pretty clear.

>SELECT CompanyName,Min(docketdate) AS FirstInvoiceDate
Here you have an expression aliased as FirstInvoice Date, with the table aliased as latest, so your expression should be...

Case when latest.firstinvoicedate = dateadd(month,-14,getdate()) then 'new work' else 'rolling work' end as 'Work Status'

I tried that before but I get the following error messages:

Server: Msg 107, Level 16, State 2, Line 1
The column prefix 'latest' does not match with a table name or alias name used in the query.
Server: Msg 107, Level 16, State 1, Line 1
The column prefix 'latest' does not match with a table name or alias name used in the query.