SQL printing error message with bad record code

Question

Working with SQL Server 2005 Creating Trigger which checks if inserting not already exist. Having problem getting record parameter, there is the code:

CREATE TRIGGER t_MFShiftTypeOperation ON [CAST$MFShiftTypeOperation]
    FOR INSERT, UPDATE AS

IF @@ROWCOUNT=1 BEGIN

IF EXISTS (SELECT * FROM inserted AS I
           JOIN CAST$MFShiftTypeOperation AS STO
           ON ((I.ShiftTypeCode = STO.ShiftTypeCode AND 
                I.PackCode = STO.PackCode) OR
                I.RegisterAppCode = STO.RegisterAppCode))
BEGIN

    DECLARE @Bad_PackCode AS EmpUserCode_t
    SET @Bad_PackCode = SELECT TOP(1) PackCode FROM inserted --there is error

    ROLLBACK TRAN
    PRINT  'Оperation with '+ @Bad_PackCode +' already exist'
END

END

when I'm trying to execute code, it throws me error message:

 Msg 156, Level 15, State 1, Procedure t_MFShiftTypeOperation, Line 16
Incorrect syntax near the keyword 'SELECT'.

Can someone explain where is mistake, or suggest better solution.

Answer 1

Change this line:

SET @Bad_PackCode = SELECT TOP(1) PackCode FROM inserted --there is error

to this:

SELECT TOP(1) @Bad_PackCode=PackCode FROM inserted