Two forms sessions locking

Hi guys i am having a problem with users locking a table in Oracle forms but when i try it in SQL it happens here too. I wondered if anyone can shed light on this?
I have posted in SQL and forms forums as not sure which is correct place!
I have created two scenerios one that works and one that doesnt based on primary key and foreign key constraints(but the one that works is not possible for us as it would mean changing table design which we cant do) .
I have hard coded in numbers 1127,1128 to make it easier (in reality this is a sequence)
ok scenerio one (our scenerio)
two tables
CREATE TABLE testSFLABPR
   (     LABP_REF_IRN VARCHAR2(25 BYTE),
     LABP_REF_REF VARCHAR2(30 BYTE),
     LABP_REF_SL NUMBER(8,0),
     LABP_CONFIG_ID NUMBER(8,0),
      CONSTRAINT PK_testLABPR_IRN_SL PRIMARY KEY (LABP_REF_IRN,LABP_REF_SL)
CREATE TABLE testSFLABP
   (     LABP_IRN VARCHAR2(25 BYTE),
     LABP_OPNO NUMBER(3,0),
     labp_no NUMBER(8,0),
      CONSTRAINT PK_testSFLABP PRIMARY KEY (LABP_IRN, LABP_OPNO, LABP_NO) ENABLE,
      CONSTRAINT testFK_SFLABP_SFLABPR FOREIGN KEY (LABP_IRN,labp_no)
       REFERENCES TESTSFLABPR (LABP_REF_IRN,LABP_REF_SL) ENABLE
   ) ;ok now session one does the following
DELETE FROM      testSFLABPR     WHERE   LABP_CONFIG_ID            = 1127;          
INSERT INTO testSFLABPR(
        LABP_REF_IRN,
        LABP_REF_SL,
        LABP_REF_REF,
        LABP_CONFIG_ID
        VALUES
        'SOPENSHELVING',
        1127,
        1127||'CF Route',
        1127
INSERT INTO testSFLABP
      LABP_IRN,
      LABP_OPNO,
      LABP_NO)
VALUES (
'SOPENSHELVING',
1,
1127);session one is left in this state.
session two now does the following
DELETE     FROM testSFLABPR     WHERE   LABP_CONFIG_ID            = 1128;     session two is now locked until a commit or rollback takes place.
If i run the exact same scenerio with only one primary key on the table no locks take place
CREATE TABLE testSFLABPR
   (     LABP_REF_IRN VARCHAR2(25 BYTE),
     LABP_REF_REF VARCHAR2(30 BYTE),
     LABP_CONFIG_ID NUMBER(8,0),
      CONSTRAINT PK_testLABPR_IRN_SL PRIMARY KEY (LABP_REF_IRN)
CREATE TABLE testSFLABP
   (     LABP_IRN VARCHAR2(25 BYTE),
     LABP_OPNO NUMBER(3,0),
     labp_no NUMBER(8,0),
      CONSTRAINT PK_testSFLABP PRIMARY KEY (LABP_IRN, LABP_OPNO, LABP_NO) ENABLE,
      CONSTRAINT testFK_SFLABP_SFLABPR FOREIGN KEY (LABP_IRN)
       REFERENCES TESTSFLABPR (LABP_REF_IRN) ENABLE
INSERT INTO testSFLABPR(
        LABP_REF_IRN,
        LABP_REF_REF,
        LABP_CONFIG_ID
        VALUES
        'SOPENSHELVING',
        1127||'CF Route',
        1127
INSERT INTO testSFLABP
      LABP_IRN,
      LABP_OPNO,
      LABP_NO)
VALUES (
'SOPENSHELVING',
1,
1127);
DELETE     FROM testSFLABPR     WHERE   LABP_CONFIG_ID            = 1128;I hope i have posted all information that is relevent.. db version were on is Oracle Database 10g Release 10.2.0.3.0 - Production
Any help is much appreciated..

You need to add index on all FK columns:
CREATE INDEX xxx ON TESTSFLABP
(LABP_IRN, LABP_NO)

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