Using a timestamp column is the only way to absolutely ensure that modifications made to a row are not overwriting someone else's changes. When it's reading a table that is open for I/O,Acu4GL for MssQL uses BROWSE MODE if a timestamp column exists. When Acu4GL is creating a table, if the value of A_MSSQL_ADD_TIMESTAMP is TRUE, a timestamp column is included in the table. (Note that your COBOL FD should not include the timestamp column.) While the default value is Off (false, no), this variable can also take values of On (true, yes).