SBO_transaction notification SAP HANA document number same series

hi expert

can anyone help me to correct the store procedure to add to Sbo_transaction notification ?

i've the same series document number for A\r Invoices and A\r credit memo.

i want to block the user to add a Docdate < the the last Document date, for the same series.

Sap B1  fill in the store procedure, but it doesn't start the control.

-

begin

    declare INDocDate DATETIME;

    declare tempDate DATETIME;

    declare conta INT;

--- add in a temp table the data

    IF (:object_type = '13' or :object_type = '14' or :object_type = '203' or :object_type = '15') and :transaction_type = ('A') then

    --IF :object_type in ('13','14','203','15') and :transaction_type in ('A') then

        BEGIN

            CREATE TABLE TEMPTABLE ( "DocEntry" INT, "Series" INT,    "SeriesName" NVARCHAR(8) ,

                                     "DocNum" INT, "DocDate" DATETIME,    "ObjType" NVARCHAR(20));

            INSERT INTO TEMPTABLE ("DocEntry", "Series","SeriesName","DocNum","DocDate","ObjType")

            Select "DocEntry",a."Series",b."SeriesName","DocNum","DocDate","ObjType"

              From OINV a Inner Join NNM1 b On a."Series"=b."Series"

              Union

              Select "DocEntry",a."Series",b."SeriesName","DocNum","DocDate","ObjType"

              From ORIN a Inner Join NNM1 b On a."Series"=b."Series"

            union

            Select "DocEntry",a."Series",b."SeriesName","DocNum","DocDate","ObjType"

              From ODPI a Inner Join NNM1 b On a."Series"=b."Series"

            union

            Select "DocEntry",a."Series",b."SeriesName","DocNum","DocDate","ObjType"

              From ODLN a Inner Join NNM1 b On a."Series"=b."Series";

              Select  T0."DocDate"  into tempDate

            From TEMPTABLE T0 Inner Join TEMPTABLE T1

            On T0."SeriesName"=T1."SeriesName"

            Where T0."DocEntry"=:list_of_cols_val_tab_del

                     And T0."ObjType"=:object_type 

                     And T0."DocDate"<T1."DocDate";

            SELECT COUNT(*) INTO Conta from TEMPTABLE;

            IF :Conta > 0  THEN

              declare INDocDate DATETIME;

                  Select T1."DocDate" into INDocDate

                  From TEMPTABLE T0 Inner Join TEMPTABLE T1

                  On T0."SeriesName"=T1."SeriesName"

                  Where T0."DocEntry"=:list_of_cols_val_tab_del And T0."ObjType"=:object_type;

                    error := -999;

                    error_message := 'DOCUMENT DATA < THEN THE LAST DOCUMENT INSERT FOR THE SAME SERIES ' ;

              END IF;

              Drop Table TEMPTABLE;

        END;

    END IF;

end;

select

       :error,

       :error_message

FROM dummy;

end;