Access / SQL Server 2000 Write Conflict error

[StyleGuide]

Hi there, I have an Access App with a SQL Server 2000 back end. When I Modify a table, then refresh the table in Access I get a 'Write Conflict' error message, even though I'm the only user logged on. This happens when I refresh the linked table in Access and also when I delete the table in Access, and then refresh. It only happens to existing rows, not new ones, and I've created a new table based on the current one, but still get the same problem. I don't get the problem if I change a row in SQL Server. I've also taken the mdb offline and online again, hoping this would reset the link. It still doesn't work. Any ideas? Thanks in advance Jon

[StyleGuide]

Solution - a new column was a bit data type : all existing rows require a value of 0 / 1 in that column.