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Partial settlement should be enabled, if there is a cross-year ledger settlement but only in already closed accounting years (advanced awareness option was enabled before closing the previous accounting year).
New validation was implemented (by hotfix ID 1025443) to ensure that no cross-year ledger settlements exist before enabling the "Partial ledger settlement" GL parameter. It should prevent problems with out-of-balance error during the year-end close.
This validation makes sense only when the "advanced awareness option" is enabled in the current - open - fiscal year, which may have transactions settled with transactions from previous years and the customer wants to enable "Partial ledger settlements" in the next step. In this scenario, validation should block enabling "Partial settlement" because once partial settlement is enabled, "Enable advanced awareness options" (GL parameter) will be permanently enabled. And cross-year ledger settlements are impossible to reverse when "Enable advanced awareness options" GL parameter is enabled. If cross-year ledger settlements are kept, they will cause an out-of-balance error during the year-end close. It will be hard for the customer to mitigate the issue in this situation.
However, if "advanced awareness options" was enabled before closing the previous year, the cross-year settlement reversal for that year was performed and year was closed correctly. According to documentation, ledger transactions that are settled across fiscal years could remain settled if they weren't settled against a transaction that was posted into year that's being closed.
Therefore, there should be no problem with the year-end closing process in the current year, which was open with enabled "advanced awareness options" and without any cross-year settlements, even if partial settlements were enabled.