Maybe I was not clear enough, sorry, but it is not the cDbCJGrid but just a cCJGrid I am working with, not datadictionaries involved.
The grid is filled only by user input and not from any datafile, sort of like a list of entries with an unknown length (if the length was known then I would have made individual forms).
I was trying to use same terms as used in the online documentation, with a line being "commited" either as a save (which is a transfer from grid objet to datasource object) or as clearing/removal of user input.
I appreciate your efforts to guide me in this, but I think I have to "buy in" some local expertise, because it is beyond my level (and I am running out of time).