anchor.diff:  		start_date :: '_' | pos_integer() | undefined,
   		end_date :: '_' | pos_integer() | undefined,
   		is_bundle = false :: '_' | boolean() | undefined,
  -		status :: '_' | product_status() | undefined,
  +		status :: product_offering_status() | '_' | undefined,
   		specification :: string(),
   		price :: '_' | [#price{}],
   		characteristics = [] :: [tuple()],
  
positive.code: 		{product :: string(),
  		start_date :: pos_integer(),
  		termination_date :: pos_integer(),
  		status :: atom(),
  		characteristics = [] :: [tuple()],
  		last_modified :: tuple() | '_' | undefined}).
  
  
negative.code: %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %%% 
  
  -type product_offering_status() :: in_study | in_design | in_test
  		| active | rejected | launched | retired | obsolete,
  -type product_status() :: created | pending_active | aborted
  		| cancelled | active | suspended | pending_terminate | terminated.
  
  %% define price types
  -type price_type() :: recurring | one_time | usage.
  