The multi-part identifier could not be bound in SQL Server 2012 - sql-server-2012

Question

I am trying to use resource attributes table in IF block. Error is in second if block:
Multi-part identifier 'ra.Start_dt' could not be bound
I have used the alias name i.e. ra, even then I get this error. Can someone help me out with this code?
IF (#toyear - #fromyear = 0)
BEGIN
SET #vacsql = 'SELECT DISTINCT
a.resourceID, r.EnterpriseID, r.FullName,
dbo.fnGetWorkOrdersByResourceID(a.resourceID,' +
CAST(#tomonth AS VARCHAR(2)) + ',' +
CAST(#toyear AS VARCHAR(4)) + ') AS WorkOrder,
dbo.fnGetDomainsByResourceID(a.resourceID,' +
CAST(#tomonth AS VARCHAR(2)) + ',' +
CAST(#toyear AS VARCHAR(4)) + ') AS Domain,
l.Offshore_Ind,
SUM(ISNULL(a.Totals, 0)) AS TOTALHOURS
FROM
[Actuals] AS a
JOIN
[Resources] AS r ON a.ResourceID = r.ResourceID
JOIN
Resource_Attributes AS ra ON r.ResourceID = ra.ResourceID
JOIN
Location_LU AS l ON ra.LocationID = l.LocationID
JOIN
Roll_On_Off AS ro ON r.ResourceID = ro.ResourceID
WHERE
(a.TaskName = ''Leave'')
AND a.CalYear = ' + CAST(#toyear AS VARCHAR(10)) +
' AND CalMonthNum <= ' + CAST(#tomonth AS VARCHAR(10)) +
' AND CalMonthNum >= ' + CAST(#frommonth AS VARCHAR(10)) +
'AND (CONVERT(datetime, ro.End_Dt)) > (CONVERT(datetime, '''+cast(concat(#frommonth,'/01/',#toyear) as varchar(10))+'''))
(CONVERT(datetime,ra.Start_dt))<=(CONVERT(datetime,#StartDate)) AND (CONVERT(datetime,ra.End_dt))>=(CONVERT(datetime,#EndDate))
GROUP BY ra.AttributeID,a.ResourceID,r.EnterpriseID,r.FullName,l.offshore_Ind'
if((CONVERT(datetime,ra.Start_dt))<=(CONVERT(datetime,#StartDate)) AND (CONVERT(datetime,ra.End_dt))>=(CONVERT(datetime,#EndDate)) AND CONVERT(datetime,ra.Start_dt) between (CONVERT(datetime,#StartDate)) AND (CONVERT(datetime,#EndDate)))
BEGIN
INSERT INTO #vacTable EXECUTE sp_executesql #vacsql,
N'#StartDate varchar(25), #EndDate varchar(25)',
#StartDate,
#EndDate;
END

Answer 1

try this!
if (#toyear-#fromyear=0)
BEGIN
Set #vacsql = 'SELECT DISTINCT a.resourceID,r.EnterpriseID,r.FullName, dbo.fnGetWorkOrdersByResourceID(a.resourceID,'+ CAST(#tomonth AS VARCHAR(2))+','+CAST(#toyear AS VARCHAR(4)) +') as WorkOrder,
dbo.fnGetDomainsByResourceID(a.resourceID,'+ CAST(#tomonth AS VARCHAR(2))+','+CAST(#toyear AS VARCHAR(4)) +') as Domain, l.Offshore_Ind,SUM(ISNULL(a.Totals,0)) AS TOTALHOURS
FROM [Actuals] AS a join [Resources] AS r on a.ResourceID=r.ResourceID
join Resource_Attributes as ra on r.ResourceID=ra.ResourceID
join Location_LU as l on ra.LocationID=l.LocationID
join Roll_On_Off as ro on r.ResourceID=ro.ResourceID
WHERE (a.TaskName=''Leave'') AND a.CalYear='+CAST(#toyear as varchar(10))+' AND CalMonthNum <='+CAST(#tomonth as varchar(10))+' AND CalMonthNum >='+CAST(#frommonth as varchar(10))+'
AND (CONVERT(datetime,ro.End_Dt))>(CONVERT(datetime,'''+cast(concat(#frommonth,'/01/',#toyear) as varchar(10))+'''))
(CONVERT(datetime,ra.Start_dt))<=(CONVERT(datetime,#StartDate)) AND (CONVERT(datetime,ra.End_dt))>=(CONVERT(datetime,#EndDate))
GROUP BY ra.AttributeID,a.ResourceID,r.EnterpriseID,r.FullName,l.offshore_Ind'
if exists (select 1 from Resource_Attributes ra where (CONVERT(datetime,ra.Start_dt))<=(CONVERT(datetime,#StartDate)) AND (CONVERT(datetime,ra.End_dt))>=(CONVERT(datetime,#EndDate)) AND CONVERT(datetime,ra.Start_dt) between (CONVERT(datetime,#StartDate)) AND (CONVERT(datetime,#EndDate)))
BEGIN
INSERT INTO #vacTable EXECUTE sp_executesql #vacsql,
N'#StartDate varchar(25), #EndDate varchar(25)',
#StartDate,
#EndDate;
END
END