Strange results for A/R Invoice #s

Hi Everyone,

I have developed a report which shows the payments made to vendors. However I am seeing some strange results in the A/P Invoice # column.

Here is the query that I have written -

/*
*    Purpose:    Lists payments made by Business Partner (and associated Invoice)
*    Date (range) and / or
*    BP (Customer Code)
*/
DECLARE @fromDate DATE,    @toDate DATE,    @bpCode nvarchar(10)
SET @fromDate = ''    IF @fromDate = ''        SET @fromDate = '2013-11-01' -- Go Live!
SET @toDate = ''    IF @toDate = ''        --'1753-01-01' -- SQL system set date        SET @toDate = GETDATE()
SET @bpCode = '' + '%'    IF @bpCode = ''        SET @bpCode = '%'
SELECT
CASE WHEN TX.rownum = 1 THEN TX.[BP (Supplier) Code] ELSE '' END AS 'BP Code'
, CASE WHEN TX.rownum = 1 THEN TX.CardName ELSE '' END AS 'BP Name'
--, CASE WHEN TX.rownum = 1 THEN TX.[Transaction ID] ELSE '' END AS 'Transaction ID'
, CASE WHEN TX.rownum = 1 THEN TX.[Payment No.] ELSE '' END AS 'Payment No.'
, TX.[For Invoice(s)] AS 'For A/P Invoice(s)'
, TX.[Paid on Invoice]  AS '$ Amount Paid for Invoice'
, CASE WHEN TX.rownum = 1 THEN TX.[Total Paid] ELSE '' END AS '$ Total Paid'
--, CASE WHEN TX.rownum = 1 THEN TX.[System Total] ELSE '' END AS 'System Total'
, CASE WHEN TX.rownum = 1 THEN TX.[Paid By] ELSE '' END 'Paid By'
FROM
(    SELECT    ROW_NUMBER() OVER(PARTITION BY T4.DocNum ORDER BY T1.TransID) AS rownum    , T0.CardCode AS 'BP (Supplier) Code'    , T0.CardName    , CAST(T1.TransId AS nvarchar) AS 'Transaction ID'    --, T1.BaseRef    , ISNULL(CAST(T4.DocNum AS nvarchar), '') AS 'Payment No.'    , ISNULL(CAST(T5.DocNum AS nvarchar), '') AS 'For Invoice(s)'    , ISNULL(CAST(CAST(T4.SumApplied AS decimal(15,2)) AS nvarchar), '') AS 'Paid on Invoice'    , CAST(CAST(T1.Debit AS decimal(15,2)) AS nvarchar) AS 'Total Paid'    , CAST(CAST(T2.SysTotal AS decimal(15,2)) AS nvarchar) AS 'System Total'    , T3.U_NAME AS 'Paid By'    FROM OCRD T0    INNER JOIN JDT1 T1 ON T1.ShortName = T0.CardCode    INNER JOIN OJDT T2 ON T2.TransId = T1.TransId    LEFT JOIN OUSR T3 ON T3.USERID = T1.UserSign    LEFT JOIN VPM2 T4 ON T4.DocNum = T2.BaseRef    -- Electronic Payments    LEFT JOIN OINV T5 ON T5.DocEntry = T4.DocEntry    WHERE T2.TransType = '46' -- Only Show 'Payments to vendors'        AND (T2.DueDate >= @fromDate AND T2.DueDate <= @toDate)        AND T0.CardCode LIKE @bpCode
) AS TX

Below is a screen capture of (a segment of) results -

My specific challenge is that (A/P) Invoices only go up to 7699 as of my writing this message.

Understandably if I perform a search for a 200K number (e.g.: 200297) I receive the error message below -

Any help with identifying why I am seeing such high results in the 'For A/P Invoice(s)' column will be greatly appreciated.

Kind Regards,

Davo