It indicates that the data integration into the database is made using specific/custom actions defined in the process whose name is given in the Import process field. This specific/custom process includes a restricted number of entry points and therefore requires the writing of a process including all the controls that should be carried out.
Its use resides in the fact that it is possible to group the controls in order to optimize the import program. The structure of the specific/custom imports is described in appendix. The following actions, among others, should be found :