Programming the statistical procedures from SAS

Proc Multtest: permutations with DDFM= SATTERTHWAITE, is that valid?

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Proc Multtest: permutations with DDFM= SATTERTHWAITE, is that valid?

As far as I know, Permutations test (i.e. resampling) requires homogeneity of variances to obtain valid results.

If that is true, how is possible to obtain correct p-value estimates from a Permutation test with the SATTERTHWAITE option of the proc multtest using the perm option with the following: test mean(var/DDFM= SATTERTHWAITE)?
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