V12.1 TRU_MIGRATIONS_DEFAULTS table question

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·     Can anyone give me some guidance on what goes in the three fields in the TRU_MIGRATION_DEFAULTS table. We are getting the error *** You must select a valid customer_no for TRU_MIGRATION_DEFAULTS. WORKER_CONSTITUENT_TEMPLATE ***  The fields in this table are free form (no dropdown) and we are having trouble finding the right section of the documentation for an explanation. Thanks.