In T-SQL cursor convert smallint to varchar

UNABLE TO CONVERT THE DLI_MAIN_CODE AND | CHAR

--SQL================================
CREATE TABLE #PROOF
(
    dli_barcode numeric NOT NULL,
    all_dli_main_code varchar(10) NOT NULL
)

DECLARE cur CURSOR for
    SELECT
       
        U.DLI_BARCODE,
        U.DLI_MAIN_CODE
        FROM OMPROD..PS_DLI_ITEM_UC U, #AD_DAILY_REPORT D
        WHERE U.DLI_MAIN_CODE IN  (7,8,89)
        AND U.DLI_BARCODE = D.CHILD_BARCODE
        AND U.SETID = D.SETID
         


DECLARE @curDLI_BARCODE NUMERIC
DECLARE @lastDLI_BARCODE NUMERIC
DECLARE @curDLI_MAIN_CODE varchar(30)
DECLARE @DLI_MAIN_CODE SMALLINT

OPEN cur
FETCH NEXT FROM cur INTO
      @curDLI_BARCODE, @curDLI_MAIN_CODE
SET @lastDLI_BARCODE = @curDLI_BARCODE
WHILE @@FETCH_STATUS = 0
BEGIN
    IF (@lastDLI_BARCODE != @curDLI_BARCODE)
    BEGIN
        INSERT INTO #PROOF(dli_barcode ,all_dli_main_code)
            VALUES(@lastDLI_BARCODE, @DLI_MAIN_CODE )    --<<<<+ '| '
        SET @lastDLI_BARCODE = @curDLI_BARCODE
        SET @DLI_MAIN_CODE = NULL
    END

    IF (@DLI_MAIN_CODE IS NULL)
        SET @DLI_MAIN_CODE = @curDLI_MAIN_CODE
    ELSE
        SET @DLI_MAIN_CODE = CONVERT(VARCHAR(10), @DLI_MAIN_CODE + N' '+ '| ' + @curDLI_MAIN_CODE) --<<<<20170428 PM

    FETCH NEXT FROM cur INTO
        @curDLI_BARCODE, @curDLI_MAIN_CODE
END

IF (@DLI_MAIN_CODE IS NOT NULL)
BEGIN
    INSERT INTO #PROOF(dli_barcode, all_dli_main_code)
        VALUES(@curDLI_BARCODE, CONVERT(VARCHAR(10), @DLI_MAIN_CODE) --<<<< 20170428 PM
END

CLOSE cur
DEALLOCATE cur
Proof.txt