We have customers, partners, and our own Professional Services group that have connected to at least two different HRIS flavors (Bamboo, Workday). I am unaware of Dimensions, but if Dimensions has an API that can satisfy the requirements noted (i.e., everything under Prerequisites section) on the following page then it should be possible.
https://developer.genesys.cloud/blueprints/wfm-hris-blueprint/
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Jay Langsford
VP, R&D
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