When I change a date field in a subform it opens a Form ( as it should ) and I select an item from a combo box. On closing this Form, it references the record on the opening subform ( works correctly ) and updates a field in it ( not shown on subform/recordset). However, on closing the Form containing the aforementioned subform, I get the write conflict error with 3 options about saving the record, copying data to clipboard etc. How do I 'get round' this, and what causes it ? Thank you.