MS Access 2007: Update calculated field in parent form after subform update -


i have access form 2 nested subforms. "data entry" parent form , beneath "header data", contains subform "capture data".

data entry linked header data field "session" , header data linked capture data "survey". both numbers.

i need field displays highest value survey. i've used "=max([survey]) this.

when had control max survey in header data subform display largest survey whichever session open. added "survey" data entry form , created control max survey there. when form opened display largest value in survey field, however, new records added given session in header subform max survey not continue update each new, larger survey number entered. i've tried control update on exit & afterupdate of survey field in header data, nothing happens or errors.

i not have experience vba or sql, appreciate bit of explanation answers involving those.

i realize problem fixed autonumber i've never had success using autonumber field link 2 tables , 35 years of data have been connected using old method, i'm cautious messing , switching manually entered auto, re-iding in process.

thank help!


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