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Are you sure it's the combination that's giving the validation error? By RAW, Unchained Monks can't take the Zen Archer archetype because the different way UM does Ki Powers conflicts with ZA.
that's not the error that I'm getting in HL.
I'd like to point out that there is a problem here regardless of the ins and outs of RAW, Unchained etc, and it should be easily fixable by the devs.
When I test a blank character, add just a level of Monk (Unchained), and then try to add Zen Archer, I get the error message you're seeing. As Maidhc said, by RAW, the zen archer archetype is not compatible with the Unchained version of the monk, only with a regular monk, because it makes changes to the original's version of how ki powers are arranged. In HL, those changes between the monk versions are noted with the same "replaced" and "modified" tags that archetypes use - it simplifies the process of tracking all those archetypes of monk, barbarian, summoner and rogue to treat the unchained versions, behind the scenes, as things that already have an archetype applied, so that the tracking we had already built to detect archetype conflicts gets applied to tracking conflicts between unchained versions and archetypes of the CRB version, rather than having to manually search for which archetypes are incompatible and write a unique error message for each.
In the community pack there is an option to allow monk archetypes for the Unchained Monk class - sounds like the way to go, Cards.