openLCA recognized a change of a data set in the context of Collaboration Server, by comparing version and last_change value. If both are the same, data sets are identified as unchanged.
If you want a change to be recognized as such, one of the values needs to be updated. To have unique identification for conflicting changes, it is strongly recommended to increase the version, and also update the last_change value, to avoid conflicting changes of the same data set (e.g. both set the same version)