After export import the number of RLinkVc and ItemHistVc are the same, so it looks like import always skips some records. One strange thing is when the client imported TB which has been made automatically the new database had wrong debts - the number of records in ARVc and APVc different 10 or so times. After importing the TB which has been made after the restart of the server, debts look OK. (version 8.4 some older build)