"Wait, that didn't work right" - the Dysfunctional Rules Collection

[Boci]

Actually, Primary Source applies here. The DMG is primary source for how prestige classes work. Unless another book specifically over-rules that, like how Spell Compendium and Magic Item Compendium specifically are the definitive new rules for the stuff in there, then any new rules about Prestige Classes can only apply to the book those rules came from- everything else refers either to itself or to the DMG if no specific rules are given.

Edit: As distinct from the Weapon-like spells rules, which are generally applied because the core books don't tell you how to deal with those.

The core book also doesn't mention what happens when you lose the requirements for a PrC, so it could be argued that there is nothing in core for CA and CW to overrule.