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OAS > Z spread for callable bonds

I am looking on bloomberg terminal, and I have looked at tens of callable bonds where OAS > Z spread, I really do not know what to make of that…. Any idea? I chatted with support and they said for some of them it is because they are perps (so what?). Anyway most were not perps ….

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Sounds like something’s wonky in their tree.

Simplify the complicated side; don't complify the simplicated side.

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