Records validation at the block level

Question

Block A
multi record block
Product code Unit No
E3056             W039708002607
E3056             W039708002721
E3056             W039708002754
Block B multi record block
Product Code Unit No
E3056               W029708002607
E3056               W039708002971  -----------different than upper block data
E3056               W039708002754
Has to validate with the data in upper block A and say wrong data when compared. CHoose right data that is in
block A How can I do it on item level of Block B?
Thanks in advance.
Anu

Answer 1

So, you cannot simply loop over block B for it will clear block C on record-navigation (as C is the detail block).
You have two options:
1. Do the check against the database table block B is based on, something like:
CURSOR cr IS
  SELECT COUNT(*)
    FROM THETABLE
  WHERE product_batch_id=:BLOCK_C.product_batch_id
    AND unit=:BLOCK_C.unit;
  nCount NUMBER;
BEGIN
  IF :BLOCK_C.UNIT!=:BLOCK_B.UNIT THEN
    --maybe another unit matches
    OPEN cr;
    FETCH cr INTo nCount;
    CLOSE cr;
    IF nCount=0 THEN
      -- Error
    END IF;
  END IF;
END;2. Fill a pl/sql-table with all the unit from block B, then loop over that pl/sql-table to validate (lot of work)