Abort inserting a record in a table using a trigger

Hi there,
Is there any way to abort inserting a record in a table using a trigger?
For full details, I have the following table ("myTable"):
BSC INTEGER NOT NULL,
BTS VARCHAR2(20) NOT NULL,
INFO1 INTEGER,
INFO2 INTEGER
myTable_PK = PRIMARY KEY (BSC,BTS)
I have also a stored procedure that imports a data from text file and inserts them to the specified table (using UTL_FILE package). The stored procedure works great.
But the thing that in the text file itselft it might be (due to third-parity report generation bug) that the primary key will be violated or the BSC/BTS field has null value. In such case I just want to ignore the insertion statement using a trigger.
Thanks

Ok Jens, could you tell me what exception could I use?
Below a protion of my StoredProcedure.
CREATE OR REPLACE PROCEDURE update_myTable() IS
FHANDLE UTL_FILE.FILE_TYPE;
BSC INTEGER;
BTS VARCHAR2(20);
INFO1 INTEGER;
INFO2 INTEGER;
BEGIN
FHANDLE := UTL_FILE.FOPEN('LOG_FILE_DIR',FILENAME,'R',4000);
LOOP
UTL_FILE.GET_LINE(FHANDLE,STR);
-- Process the line STR and generates BSC, BTS, INFO1, and INFO2 values
EXECUTE IMMEDIATE 'INSERT INTO myTable VALUES(:1,:2,:3,:4)' USING BSC,BTS,INFO1,INFO2;
END LOOP;
EXCEPTION WHEN NO_DATA_FOUND THEN UTL_FILE.FCLOSE(FHANDLE);
END UPDATE_R205BTS;
Remember that I am already using an exception with NO_DATA_FOUND to indicate the end of file then closing it.
Thanks for your reply

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