URGENT : Master Detail Form problem

Question

the senario 1 is :
i have a (Master --> Detail ---> SubDetail) form
the Master and Detail Parts are displayed on
canvas and have relation on block level as well as in
DB,
but the third SubDetail part has only db relation and
it is updated on commit.
On PostQuery trigger in Detail Part , the related
information in SubDetail is placed in a temporary
table (XYZ)
this temporary table is updated on validation of a
field in Detail Part.
The above mentioned process WORK FINE FOR THE FIRST
TIME , BUT SECOND TIME ON EDITING A RECORD IN DETAIL
PART FAILS.
AND GEBNERATE THE FOLLOWING ERROR
WHEN-VALIDATE-ITEM RAISED UNHANDLED EXCEPTION
ORA-00600
--=============================================================================================================
THE SENARIO 2 IS:
I have 4 tables
Invoice_MT = A
Invoice_detail = B
INVOICE_EXPENSES = C
GRN_DETAIL = D
THE A TABLE HAVE (one to many) JOIN WITH B AS
WELL AS C.
THE D TABLE HAVE (one to many) JOIN WITH B
THE INFORMATION IN C TABLE IS ALSO PLACED IN B
TABLE AFTER CALCULATION.
THIS CALCULATION IS DONE THROUGH
1- ROW AND STATEMENT LEVEL DB TRIGGERS ON C
TABLE
OR
2- ROW AND STATEMENT LEVEL DB TRIGGERS ON B
TABLE
WHEN THIS UPDATION IS DONE THROUGH " ROW AND
STATEMENT LEVEL DB TRIGGERS ON B TABLE "
THERE INVOLVES A TEMPORARY TABLE (ON COMMIT DELETE
ROWS)
WHICH IS POPULATED ON ROW LEVEL AND USED TO UPDATE
"D" TABLE ON STATEMENT LEVEL.
THE STATEMENT LEVEL TRIGGER OF TABLE B ALSO
INCLUDE THE REMAINING ROWS FROM B TABLE WHICH ARE
NOT UPDATED FROM USER INTERFACE.
DURING THIS STAEMENT LEVEL PROCESS THE FOLLOWING
ERRORS RAISED ...
INTERNAL ERROR CODE ATGUMENTS ORA-00600
[4521],[2],[132033],[0],[4234644],[4294967295],[4294967295],[]
INTERNAL ERROR CODE ATGUMENTS ORA-00600
[4553],[2],[25],[],[],[],[],[]
THE ABOVE ERRORS ARE RAISED IN DIFFERENT TIMES BUT
ON SAME STATEMENT

Answer 1

I don't fully understand what you are trying to accomplish, but if you just need to validate the number entered into MY_ITEM, the "WHEN-VALIDATE-ITEM" trigger is normally used for doing that. If it fails validation, just display your alert message and raise a "FORM-TRIGGER-FAILURE" exception which will leave the focus on the field.