Parameter Prompt Annoyingly Appears (sometimes)

I have a form that I set the SQL query to either

if len(sParam) = 0 then
sSQL = "Year=2007"
Works fine I get all records for that year

If len(sParam) 0 then
sSQL = "Year=2007" & " and " & sParam
(value= "Year=2007 and salesrep = 'RosieS'")

Now I'm prompted to enter a parameter for salesrep - where does that come
from?

My report has a query that returns all records - no parameters or other
criteria.

Query... only criteria is that the job ID's exist...

SELECT [Main Job Log].[Job #], [T_Year].[Year] AS [Year], [Main Job
Log].[Owner], [Main Job Log].[Name], [Main Job Log].[City], [Main Job
Log].[Manufacturer], [Main Job Log].[RoofSystem], [Main Job Log].[SqFt],
[Main Job Log].[SalesRep], [T_Year].[Year]
FROM [Main Job Log] INNER JOIN T_Year ON ([Main Job Log].[Job
#]=[T_Year].[IDEnd]) AND ([Main Job Log].[Job #]=[T_Year].[IDStart])
ORDER BY [Main Job Log].[Job #];
....end query

...frmReport snipit....
sReportName = sRptName
sWhereFieldName = Me.lbl_WhereFieldName.Caption
sWhereFieldValue = Me.cbo_RptOptionList.Value

If Me.cbo_Year.Visible = True Then
sYear = "Year=" & Me.cbo_Year.Value
Else: sYear = ""
End If

If Me.cbo_RptOptionList.Value = "_All" Then
sWhere = ""
Else:
sWhere = sWhereFieldName & " = '" & sWhereFieldValue & "'"
End If

Select Case Len(Left(sYear, 1)) + Len(Left(sWhere, 2))
Case 3
sQry = sYear & " and " & sWhere
Case 2
sQry = sWhere
Case 1
sQry = sYear
Case 0
sQry = sWhere
End Select

DoCmd.OpenReport sReportName, acViewPreview, , sQry
....end snipit....