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The Legacy Person ID — and other "legacy" fields on the person, household, and organization records — are intended to carry an identification number from a third party platform over to Veracross.
Schools often insert legacy ID values during implementation as part of the mapping between their old "legacy" database and their Veracross database. It is often necessary to preserve these legacy IDs to support a third party integration that use the ID values for data mapping.
Talk to your account manager if you are unsure of the purpose of the legacy IDs in your system.