SQL Server Stored Procedure instance

ALTER PROC [dbo]. [Sp_mm_ns] (
@ID NVARCHAR (60),
@ReturnCode NVARCHAR () OUTPUT,
@ErrorMessage NVARCHAR (+) OUTPUT
)
As
BEGIN
DECLARE
@rtnCode NVARCHAR (30),
@rtnText NVARCHAR (2000)


DECLARE
@P_BillID NVARCHAR (60),
@P_LineItemNo INTEGER

SELECT @rtnCode = ' 0 ', @rtnText = '

BEGIN TRY
SELECT * FROM dbo. Mdms_account

END TRY
BEGIN CATCH
SET @rtnText = ' error_procedure= ' + error_procedure ()
+ ', error_line= ' +convert (varchar), error_line ())
+ ', error_number= ' + CONVERT (varchar (ten), Error_number ())
+ ', error_message= ' +left (error_message (), 255)
SET @rtnCode = ' 1 '

END CATCH
L_end:

SELECT @ReturnCode = @rtnCode, @ErrorMessage = @rtnText
END

SQL Server stored procedure instance