SQL Query Returning Multiple Records when only single records should be returned

Question

I have a SQL query that I am running with multiple joins to return the required results however, when add into my select statement this field requirements MX.TFNO AS 'BULK TO SPLIT REFERENCE' I get duplicate rows of data that are incorrect yet when I comment out this line, the query works correctly yet without the data that should be returned into the above mentioned column.

Below is my query. Please note that I have a join that I have commented out for table MPEXOR as I have yet set up this table in our datalake to pull in that data.

SELECT distinct
MP.SUNO AS 'SUPPLIER',
CI.SUNM AS 'SUPPLIER NAME',
MP.FACI AS 'FACILITY',
MP.WHLO AS 'WAREHOUSE',
MP.OURR AS 'SUPPLIER PO',
CONCAT(MM.BUAR ,'/', MP.PROJ) AS 'PO GROUP',
MP.PUNO AS 'PURCHASE ORDER NUMBER',
    IIF (MP.PUNO LIKE '533%', 'SPLIT',
    IIF (MP.PUNO LIKE '511%', 'BULK', '')) as 'PO TYPE',
--MX.TFNO AS 'BULK TO SPLIT REFERENCE',
MP.PNLI AS 'PO LINE NUMBER',
MP.ITNO AS 'ITEM NUMBER',
MP.PITD AS 'STYLE',
MH.TX15 AS 'SIZE',
MH.TY15 AS 'COLOR',
MM.BUAR AS 'BRAND',
CONVERT(varchar,MP.DWDT, 101) AS 'EX FACTORY ORIGINAL DATE',
CONVERT(varchar,MP.CODT,101) AS 'REVISED EX FACTORY DATE',
    IIF (MP.MODL = 'S', 'OCEAN',
    IIF (MP.MODL = 'C', 'COURIER',
    IIF (MP.MODL = 'G', 'CONSIGNEE OPTION',
    IIF (MP.MODL = 'H', 'CUSTOMER PICK UP',
    IIF (MP.MODL = 'M', 'MOTOR',
    IIF (MP.MODL = 'A', 'AIR', '')))))) as 'DELIVERY METHOD',
MP.ORQA AS 'ORDERED QTY',
MF.UCOS AS 'COST PRICE',
MP.PUPR AS 'PURCHASE PRICE',
MP.PUST AS 'PO LOW STATUS',
MP.PUSL AS 'PO HIGH STATUS',
MP.ORCO AS 'COUNTRY OF ORIGIN'
--MX.HREF AS 'PO REFERENCE'
FROM MPLINE MP
INNER JOIN CIDMAS CI WITH (NOLOCK)
    ON CI.CONO = MP.CONO
    AND CI.SUNO = MP.SUNO
    AND CI.DELETED = 'N'
LEFT JOIN MITFAC MF WITH (NOLOCK)
    ON MF.CONO = MP.CONO
    AND MF.FACI = MP.FACI
    AND MF.ITNO = MP.ITNO
    AND MF.DELETED = 'N'
LEFT JOIN MITMAH MH WITH (NOLOCK)
    ON MH.CONO = MP.CONO
    AND MH.ITNO = MP.ITNO
    AND MH.DELETED = 'N'
LEFT JOIN MITMAS MM WITH (NOLOCK)
    ON MM.CONO = MP.CONO
    AND MM.ITNO = MP.ITNO
    AND MM.DELETED = 'N'
LEFT JOIN MPHEAD MX WITH (NOLOCK)
    ON MX.CONO = MP.CONO
    AND MX.SUNO = MP.SUNO
    AND MX.FACI = MP.FACI
    AND MX.WHLO = MP.WHLO
    AND MX.ORTY = MP.ORTY
    AND MX.DELETED = 'N'
--LEFT JOIN MPEXOR ME
    --ON ME.CONO = MP.CONO
    --AND ME.PUNO = MP.PUNO
WHERE MP.PUST < 50
    AND MP.PUSL < 50
    AND MP.PUNO = '5330000172'
--ORDER BY MP.PUNO, MP.PNLI
;

Here is the return result with MX.TFNO in place

SUPPLIER    SUPPLIER NAME   FACILITY    WAREHOUSE   SUPPLIER PO PO GROUP    PURCHASE ORDER NUMBER   PO TYPE BULK TO SPLIT REFERENCE PO LINE NUMBER  ITEM NUMBER STYLE   SIZE    COLOR   BRAND   EX FACTORY ORIGINAL DATE    REVISED EX FACTORY DATE DELIVERY METHOD ORDERED QTY COST PRICE  PURCHASE PRICE  PO LOW STATUS   PO HIGH STATUS  COUNTRY OF ORIGIN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT       1   P001656-03162XL ALAYA-SF    2XL Juniper SK  20210809    0   OCEAN   3.000000    58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT       2   P001656-0316L   ALAYA-SF    L   Juniper SK  20210809    0   OCEAN   20.000000   58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT       3   P001656-0316M   ALAYA-SF    M   Juniper SK  20210809    0   OCEAN   25.000000   58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT       4   P001656-0316S   ALAYA-SF    S   Juniper SK  20210809    0   OCEAN   16.000000   58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT       5   P001656-0316XL  ALAYA-SF    XL  Juniper SK  20210809    0   OCEAN   12.000000   58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT       6   P001656-0316XS  ALAYA-SF    XS  Juniper SK  20210809    0   OCEAN   4.000000    58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT   PO#29371    1   P001656-03162XL ALAYA-SF    2XL Juniper SK  20210809    0   OCEAN   3.000000    58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT   PO#29371    2   P001656-0316L   ALAYA-SF    L   Juniper SK  20210809    0   OCEAN   20.000000   58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT   PO#29371    3   P001656-0316M   ALAYA-SF    M   Juniper SK  20210809    0   OCEAN   25.000000   58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT   PO#29371    4   P001656-0316S   ALAYA-SF    S   Juniper SK  20210809    0   OCEAN   16.000000   58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT   PO#29371    5   P001656-0316XL  ALAYA-SF    XL  Juniper SK  20210809    0   OCEAN   12.000000   58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT   PO#29371    6   P001656-0316XS  ALAYA-SF    XS  Juniper SK  20210809    0   OCEAN   4.000000    58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT   PO#29373    1   P001656-03162XL ALAYA-SF    2XL Juniper SK  20210809    0   OCEAN   3.000000    58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT   PO#29373    2   P001656-0316L   ALAYA-SF    L   Juniper SK  20210809    0   OCEAN   20.000000   58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT   PO#29373    3   P001656-0316M   ALAYA-SF    M   Juniper SK  20210809    0   OCEAN   25.000000   58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT   PO#29373    4   P001656-0316S   ALAYA-SF    S   Juniper SK  20210809    0   OCEAN   16.000000   58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT   PO#29373    5   P001656-0316XL  ALAYA-SF    XL  Juniper SK  20210809    0   OCEAN   12.000000   58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT   PO#29373    6   P001656-0316XS  ALAYA-SF    XS  Juniper SK  20210809    0   OCEAN   4.000000    58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT   PO#427  1   P001656-03162XL ALAYA-SF    2XL Juniper SK  20210809    0   OCEAN   3.000000    58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT   PO#427  2   P001656-0316L   ALAYA-SF    L   Juniper SK  20210809    0   OCEAN   20.000000   58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT   PO#427  3   P001656-0316M   ALAYA-SF    M   Juniper SK  20210809    0   OCEAN   25.000000   58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT   PO#427  4   P001656-0316S   ALAYA-SF    S   Juniper SK  20210809    0   OCEAN   16.000000   58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT   PO#427  5   P001656-0316XL  ALAYA-SF    XL  Juniper SK  20210809    0   OCEAN   12.000000   58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT   PO#427  6   P001656-0316XS  ALAYA-SF    XS  Juniper SK  20210809    0   OCEAN   4.000000    58.750000   47.500000   20  20  CN

Here is the return result without MX.TFNO in place

SUPPLIER    SUPPLIER NAME   FACILITY    WAREHOUSE   SUPPLIER PO PO GROUP    PURCHASE ORDER NUMBER   PO TYPE PO LINE NUMBER  ITEM NUMBER STYLE   SIZE    COLOR   BRAND   EX FACTORY ORIGINAL DATE    REVISED EX FACTORY DATE DELIVERY METHOD ORDERED QTY COST PRICE  PURCHASE PRICE  PO LOW STATUS   PO HIGH STATUS  COUNTRY OF ORIGIN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT   1   P001656-03162XL ALAYA-SF    2XL Juniper SK  20210809    0   OCEAN   3.000000    58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT   2   P001656-0316L   ALAYA-SF    L   Juniper SK  20210809    0   OCEAN   20.000000   58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT   3   P001656-0316M   ALAYA-SF    M   Juniper SK  20210809    0   OCEAN   25.000000   58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT   4   P001656-0316S   ALAYA-SF    S   Juniper SK  20210809    0   OCEAN   16.000000   58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT   5   P001656-0316XL  ALAYA-SF    XL  Juniper SK  20210809    0   OCEAN   12.000000   58.750000   47.500000   20  20  CN
5046    ZHEJIANG AMP GLOBE IMP & EXP CO LTD US1 U01     SK/FW21 5330000172  SPLIT   6   P001656-0316XS  ALAYA-SF    XS  Juniper SK  20210809    0   OCEAN   4.000000    58.750000   47.500000   20  20  CN

Answer 1

The issue found was actually an issue in the database which we needed the software developer to provide a fix. When the fix was installed and I ran the query the issues was resolved and the report for this was pushed into production environment and now being used.