Getting an error when trying to execute procedure within a procedure - sql-server

Question

I'm trying to write a procedure that executes another procedure within it, but I'm getting this error
Incorrect syntax near '#PRIMARY_AM'
but I get this error only with the variables that have a CAST() OR ISNULL() OR REPLACE() function. If I comment out the line with #PRIMARY_AM it will then say
Incorrect syntax near 'ISNULL'
CREATE PROCEDURE [dbo].[RUN_PROCESS]
#PRIMARY_NO VARCHAR(20) = NULL,
#COMBINED_AM INT = NULL,
#PRIMARY_BOR VARCHAR(40) = NULL,
#PRIMARY_AM INT = NULL,
#SECONDARY_AM INT = NULL,
#SECONDARY_DT SMALLDATETIME = NULL,
#PRIMARY_CD VARCHAR(10) = NULL,
#O_ID INT OUTPUT
AS
EXEC dbo.LINK_PROCESS
#PRIMARY_NO = #PRIMARY_NO,
#COMBINED_AM = CAST(#PRIMARY_AM + #SECONDARY_AM AS VARCHAR),
#PRIMARY_BOR = REPLACE(ISNULL(#PRIMARY_BOR, ''), '''',' '),
#PRIMARY_AM = CAST(ISNULL(#PRIMARY_AM, 0) AS VARCHAR),
#SECONDARY_AM = CAST(ISNULL(#SECONDARY_AM, 0) AS VARCHAR),
#SECONDARY_DT = CAST(#SECONDARY_DT AS VARCHAR),
#PRIMARY_CD = ISNULL(#PRIMARY_CD, ''),
#O_ID = #O_ID OUTPUT;
If I remove those functions CAST(), REPLACE() and ISNULL() then I can execute the query without a problem. I don't know why this isn't working.
I'm using SQL Server 2005

Answer 1

This is the solution to my problem, thanks to Alex and his comment under my question
Stored procedures, accept parameters (variables and constants) but not
expressions. You need to do all casting before calling your SP. – Alex
CREATE PROCEDURE [dbo].[RUN_PROCESS]
#PRIMARY_NO VARCHAR(20) = NULL,
#COMBINED_AM INT = NULL,
#PRIMARY_BOR VARCHAR(40) = NULL,
#PRIMARY_AM INT = NULL,
#SECONDARY_AM INT = NULL,
#SECONDARY_DT SMALLDATETIME = NULL,
#PRIMARY_CD VARCHAR(10) = NULL,
#O_ID INT OUTPUT
AS
DECLARE #COMBINED VARCHAR
SET #COMBINED = CAST(#PRIMARY_AM + #SECONDARY_AM AS VARCHAR)
DECLARE #PRIM_BOR VARCHAR(40)
SET #PRIM_BOR = REPLACE(ISNULL(#PRIMARY_BOR, ''), '''',' ')
DECLARE #PRIM_AM VARCHAR
SET #PRIM_AM = CAST(ISNULL(#PRIMARY_AM, 0) AS VARCHAR)
DECLARE #SEC_AM VARCHAR
SET #SEC_AM = CAST(ISNULL(#SECONDARY_AM, 0) AS VARCHAR)
DECLARE #SEC_DT VARCHAR
SET #SEC_DT = CAST(#SECONDARY_DT AS VARCHAR)
DECLARE #PRIM_CD VARCHAR(10)
SET #PRIM_CD = ISNULL(#PRIMARY_CD, '')
EXEC dbo.LINK_PROCESS
#PRIMARY_NO = #PRIMARY_NO,
#COMBINED_AM = #COMBINED,
#PRIMARY_BOR = #PRIM_BOR,
#PRIMARY_AM = #PRIM_AM,
#SECONDARY_AM = #SEC_AM,
#SECONDARY_DT = #SEC_DT,
#PRIMARY_CD = #PRIM_CD,
#O_ID = #O_ID OUTPUT;