i'm trying to use crystal report to make a packing slip (don't ask me why  ):
first, i couldn't find a field showing packing slip number, so i used invoice number instead, since they are the same.
 
then i put MTIT_INV, MTIT_CODE and MTIT_LOT in the report. by using 'select expert', i let the report list all the items on certain packing slip with their lot numbers.  
 
i found out that for some packing slips, the list of items is not right.  some items are missed.  i couldn't figure out why.  anybody help please~~