In ICM, when only updating a value via CSV file (Network -> Import -> Update from CSV files), the data flag should be left untouched instead of being "blanked" or updated with a new value (based on the "Flag to use for new/updated data" in the 'import from CSV data" screen)
We generate CSV files from external data sources so we take the opportunity to bring in any data pedigree information we have by populating the flag fields. Our modelling specification prohibits the use of the #V flag. The import dialogue defaults to #V so we always change this to blank to ensure that we avoid getting #V in our networks. In our view, #V is not a useful flag as it doesn't convey any beneficial information.