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- PRIMARY_ASSET_ID^PRIMARY_ASSET_ID_TYPE^UNDERLYING_TYPE – simple structure, however we can resolve records without primary id/type. So it may be an issue
- SECURITY_ALIAS^ UNDERLYING_TYPE – this structure allows to avoid any misunderstanding for record recognition, however it requires the user to perform resolution before load.
- XREF_ID1^XREF_TYPE1^UNDERLYING_TYPE – in this case it is expected that the use user would take any the first identifier pair in the file for batch key generation.
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