Question relates to a database for tracking the "time used" for gages in a factory. I have a main form called "Gage" with a subform "Issues" and a second subform "Usage". Issues' data source is a table that tracks when a gage is issued out for use, and when it returns (field names are DateOut and DateReturned). The Usage subform's data source is a query that calculates the total elapsed time that the gage has been issued. When the DateReturned field (on Issues subform)is modified, I want it to trigger a recalculation of the fields on the Usage subform. I have been trying to use the requery macro without success - the error message is something to the effect... "You can't use the ApplyFilter action on this window...". I have tried a variety of object names for the requery, but none have worked. I am using Access 2000. Thanks for any suggestions.