ED2 KC- Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect)

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Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect) : [org.hisp.dhis.category.CategoryOptionCombo#7056298]

This is a hibernate/spring generated error. Something to do with database stuff.

You need to regenerate resource tables so that the category structure is regenerated fresh and the tables are cleaned up.