Software Architect's Handbook

Don't make things overly DRY

When attempting to follow the DRY principle, be careful not to consolidate disparate items that just happen to be duplicates in some way. If two or more things are duplicates, it may be that they are just coincidentally repetitive.

For example, if two constants have the same value, that does not mean they should be combined into one constant for the sake of eliminating duplication. If the constants represent distinct concepts, they should remain separate.