Common wisdom is that transaction numbers in AR are decided by the batch source. But what if you wanted to have numbering specific to transaction type of these transactions that use the same batch source (invoice should have one sequence number and Credit Memos should have different sequences and so on)? Also some users of Oracle AR in different countries need to follow the sequence numbers specific to periods (every year or every month I want follow different sequence numbering). Well, here is the presentation that gives you simple steps to achieve the same. Hope this is useful.