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In syncing data with target systems, the link to an entity might not be the same sourceId/subjectId tuple that Grouper uses. Maybe an attribute or expression needs to be evaluated against the subject to link the entities. This paces places an undo burden on these operations since resolving subjects from an external system is expensive performance-wise. Further there are issues when subjects become unresolvable to clean up provisioned data where the links are broken.
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