[dba-SQLServer] SP read only

Folks,

I have the following SP.  It selects data from a single table, filtered on
two fields.  Pretty simple.  It is also read-only inside the SMS Express
tool.  The table itself is editable, i.e. if I just open the table I can
modify values.  Does anyone know if parameterized SPs are supposed to be
editable?  
If so, what can cause the SP result set to be Read Only?

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:		<Author,,Name>
-- Create date: <Create Date,,>
-- Description:	<Description,,>
-- =============================================
CREATE PROCEDURE usp_FrmCallListFiltered
	-- Add the parameters for the stored procedure here
	@STID int,
	@DIID int
AS
BEGIN
	-- SET NOCOUNT ON added to prevent extra result sets from
	-- interfering with SELECT statements.
	SET NOCOUNT ON;

    -- Insert statements for procedure here
	SELECT tblPeople.PE_ID, tblPeople.PE_IDCRF, tblPeople.PE_Specialty,
tblPeople.PE_LName, tblPeople.PE_FName, tblPeople.PE_MName,
tblPeople.PE_Addr1, tblPeople.PE_Addr2, tblPeople.PE_City,
tblPeople.PE_Zipcode1, tblPeople.PE_Zipcode2, tblPeople.PE_IDST,
tblPeople.PE_PhoneH, tblPeople.PE_PhoneW, tblPeople.PE_Currempl,
tblPeople.PE_Contact1, tblPeople.PE_Licotherstates, tblPeople.PE_RateInfo,
tblPeople.PE_Worktime, tblPeople.PE_Email, tblPeople.PE_BusAddress,
tblPeople.PE_Certification, tblPeople.PE_LIC_Licno,
tblPeople.PE_DateStampName, tblPeople.PE_DateStampAddress,
tblPeople.PE_DateStampPhoneH, tblPeople.PE_PhoneCell, tblPeople.PE_IDDNC,
tblPeople.PE_IDIWH, tblPeople.PE_MBIF, tblPeople.PE_MBIFFollowUpDate,
tblPeople.PE_HotLead, tblPeople.PE_HotLeadNotes, tblPeople.PE_Inactive,
tblPeople.PE_NoHomePhoneInfo, tblPeople.PE_FOE, tblPeople.PE_LIC_IDST,
tblPeople.PE_LIC_IDDI
	FROM tblPeople
	WHERE (((tblPeople.PE_LIC_IDST)=@STID) AND
((tblPeople.PE_LIC_IDDI)=@DIID))
	ORDER BY tblPeople.PE_LName, tblPeople.PE_FName;

END
GO

John W. Colby
www.ColbyConsulting.com