• The AR Dunning Letters is obsolete in R12.
  
• The AR Collections Workbench is obsolete in Release 12.
  
• You will need to install the Oracle Advanced Collections application.
  
• The basic Collections functionality is available in Oracle Advanced Collections without any extra cost. However, if you wish to use the more complex functionality in the Oracle Advanced Collections, you will need to pay for license cost.
  
• In R12 Advanced collections, you will now need to run Oracle Advanced Collections Dunning Plans instead.
  
• To using the Dunning Plan basic functionality you donot requires Oracle Advanced Collections license.
  
• The Dunning process in R12 Collections is based on Scoring. You can set it up so that a particular score is associated to a Dunning Letter Plan. Then only allow that one customer to get that score. Dunning Plans in Advanced Collections replace Dunning Letters in 11i AR , thus dunning Plans will need to be setup.
  
• Staged Dunning Letters does not exist in R12 Collections rather can be used the Standard Dunning Plans in R12 of Collections. However, for a more complex timing and use of Dunning letters you will want to setup the highly configurable Strategies and send your letters in this manner.Customer interactions and correspondence, transaction processing, and dunning activities are consider as basic functionality whereas scoring, collections strategies, enhanced payment and promise processing, automated promise tracking, and automated collector work assignment are consider as advance feature of product.
  
• In R12, dunning functionality is executed by XML Publisher.