UA supports only two levels for linked components. During a sync-update operation, each separate insert/update application that is linked is executed serially (level 1s first, then level 2s). The portal has no transaction coordinator, so each application execution happens independently in the auto-commit mode. If one application fails, the portal does not roll back changes that were made to other applications. The administrator must manually correct data in this case.
SAP applications that have level 2 implicit tables are executed all at once. Even though they are auto-commit, the 1st and 2nd level data are applied simultaneously, so there is no possibility for a partial update failure.
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