LSMW me51n, how to create one PR document for all the records in the file

Question

HI all,
I need to create LSMW for t-code me51n -Create Purchase Requisition. I`m using Bapi BUS2105, method CREATEFROMDATA, idoc message type PREQCR, basic type PREQCR03. The problem is that the LSMW is creating different idoc and different PR document for every record in the source file. My requirement is to create one PR document for one source file (Every source file is different Purchase Requisition) . I`m trying to do this with writing some code(global functions ) in the 'Mapping and conversion rules'  events - BEGINOF_TRANSACTION_, ENDOF_TRANSACTION__..., but i`m not very sure what exactly i`m doing .
Please help me resolve this problem, any help will be appreciated .
Best regards, Emil Milchev.

Answer 1

Thank you for you answer.
But I have found faster way of doing it - two source structures, one HEADER and ONE ITEM.
HEADER: one empty text field and identificator for it.
ITEM: everything else.
Then everything was just fine, i`ve mapped the different IDOC segments by PREQ_ITEM fields (equal values in the source file : 10-10-10..., 20-20-20,.... etc.) and put all required fields for my LSMW
SOURCE FIELDS:
Z_ME51N_V2 - MASS_UPLOAD - CREATE create
Source Fields
UPFILE                    upload file
            IDENT                          C(010)    ident
                                           Identifing Field Content: header
            TEXT                           C(001)
            UPFILE2                   123
                IDENT                          C(010)    ident
                                               Identifing Field Content: item
                BSART                          C(004)    Document type
                BANFN                          C(010)    Purchase requisition number
                BNFPO_FOR_MAP                  N(005)    Item number of purchase req. for MAPPING acc.
                BNFPO                          N(005)    Item number of purchase requisition
                KNTTP                          C(001)    Account assignment category
                PSTYP                          C(001)    Item category in purchasing document
                MATNR                          C(018)    Material Number
                WERKS                          C(004)    Plant
                LGORT                          C(004)    Storage Location
                MENGE                          N(013)    Purchase requisition quantity
                EKGRP                          C(003)    Purchasing group
                KONNR                          C(010)    Number of principal purchase agreement
                KTPNR                          N(005)    Item number of principal purchase agreement
                LIFNR                          C(010)    Desired Vendor
                FLIEF                          C(010)    Fixed Vendor
                AFNAM                          C(012)    Name of requisitioner/requester
                PREIS                          AMT4(011) Price in purchase requisition
                ABLAD                          C(025)    Unloading Point
                WEMPF                          C(012)    Goods Recipient
                PS_POSID                       C(024)    Work Breakdown Structure Element (WBS Element)
                KOSTL                          C(011)    COST_CTR v bapito ?
                NAME1                          C(040)    Name1 - Name of an address
                NAME2                          C(040)    Name2 - Name of an address 2
                STREET                         C(060)    Street
                DELIVERY_DATE                  C(008)    Date on which the goods are to be delivered
                TEXT                           C(132)    item text
STRUCTURE RELATIONS :
Structure Relations
E1PREQCR              Header segment                                               <<<< UPFILE  upload file
           E1BPEBANC             Transfer Structure: Create Requisition Item                  <<<< UPFILE2 123
           E1BPEBKN              Transfer Structure: Create/Display Requisition Acct Assgt    <<<< UPFILE2 123
           E1BPEBANTX            BAPI Purchase Requisition: Item Text                         <<<< UPFILE2 123
           E1BPESUHC             Communication Structure: Limits                              <<<< UPFILE2 123
           E1BPESUCC             Communication Structure: Contract Limits                     <<<< UPFILE2 123
           E1BPESLLC             Communication Structure: Create Service Line                 <<<< UPFILE2 123
           E1BPESKLC             Create Comm. Structure: Acct Assgt Distr. for Service Line   <<<< UPFILE2 123
           E1BPESLLTX            BAPI Services Long Text                                      <<<< UPFILE  upload file
           E1BPMERQADDRDELIVERY  PO Item: Address Structure BAPIADDR1 for Inbound Delivery    <<<< UPFILE2 123
               E1BPMERQADDRDELIVERY1 PO Item: Address Structure BAPIADDR1 for Inbound Delivery    <<<< UPFILE2 123
           E1BPPAREX             Ref. Structure for BAPI Parameter EXTENSIONIN/EXTENSIONOUT   <<<< UPFILE2 123
MAINTAIN FIELD MAPPING AND... :
the MAPPING between two IDOC`s segments:
In first segment:
E1BPEBANC                      Transfer Structure: Create Requisition Item
         Fields
             PREQ_NO                      Purchase requisition number
                                 Source:  UPFILE2-BANFN (Purchase requisition number)
                                 Rule :   Transfer (MOVE)
                                 Code:    E1BPEBANC-PREQ_NO = UPFILE2-BANFN.
             PREQ_ITEM                    Item number of purchase requisition
                                 Source:  UPFILE2-BNFPO (Item number of purchase requisition)
                                 Rule :   Transfer (MOVE)
                                 Code:    E1BPEBANC-PREQ_ITEM = UPFILE2-BNFPO.
In second segment :
E1BPEBKN                       Transfer Structure: Create/Display Requisition Acct Assgt
           Fields
               PREQ_NO                      Purchase requisition number
               PREQ_ITEM                    Item number of purchase requisition
                                   Source:  UPFILE2-BNFPO_FOR_MAP (Item number of purchase req. for MAPPING
                                   Rule :   Transfer (MOVE)
                                   Code:    E1BPEBKN-PREQ_ITEM = UPFILE2-BNFPO_FOR_MAP.
After that everything was OK .