| Scenario | Old | New | Results in IM29 | 
	
		| If you recode MODELA to MODELB, you need to delete MODELB in IM29, enter the recode parameters in RM81 and then run RM82. MODELA will cease to exist; history for MODELA and MODELB will be merged and reported under MODELB; the components of MODELA will become the components of MODELB in IM29.
 | MODELA COMP1
 COMP2
 | MODELB COMP3
 COMP4
 | MODELB COMP1
 COMP2
 | 
	
		| If you want to recode MODELA to MODELB, but retain the components of MODELB, then you need to do a multi-step procedure: | 
	
		| Recode MODELB to a temporary product code. RM82 only does a recode. MODELB is now gone; history and IM29 are under MODELTEMP. | MODELB COMP3
 COMP4
 | MODELTEMP (does not exist
 in IM13)
 | MODELTEMP COMP3
 COMP4
 | 
	
		| Recode MODELA to MODELB. RM82 only does a recode. MODELA is now gone; MODELA's history and IM29 are under MODELB. | MODELA COMP1
 COMP2
 | MODELB (does not exist
 in IM13)
 | MODELB COMP1
 COMP2
 | 
	
		| Delete model definition for MODELB in IM29. | 
	
		| Recode MODELTEMP to MODELB. RM82 does a recode/merge of history. MODELTEMP is now gone; original history and IM29 from MODELB --> MODELTEMP are now back to MODELB along with history from original MODELA. | MODELTEMP COMP3
 COMP4
 (history and components of original MODELB)
 | MODELB (exist in IM13
 but not in IM29)
 (history and components of original MODELA)
 | MODELB COMP3
 COMP4
 (history of A&B; components of original MODELB)
 | 
	
		| Double check product description of MODELB in IM13; expect it to be the description of original MODELA. |