Property :: repairBaseCollection - Repair superset (base collection) hierarchy
For some reason, elements of a subset have not been added to its superset. This might happen, when an application terminates abnormally while writing a transaction to the database.
The function adds the selected instance to the superset (when not existing). The function returns 0, when everything was ok (no elements missed in the superset), 1 when one the selected instance had been added to the superset and -1 in case of error (e.g. no instance selected).
Return value: Number of items ( int32 )
The value contains the number of items to be processed or stored in a collection.

