ms access - Show on Main form the value of a Text box on sub form -


i have sub form (continuous form) shows sum of fee in text box in subform footer: 

text5 data =sum(fee).

this works correctly. can't show value in text box on main form. have tried 

tfees = forms!frminvoice![frminvoicedetails].form.text5

this shows nothing (null?) on main from. no errors. data subform is:

select      tblinvoicedetails.invoicelookup,      tblinvoicedetails.disclookup,      [applicantsurname] & ', ' & [applicantforenames] appname,      [dbsfee]+[myfee] fee,      tbldisclosure.client,      tbldisclosure.payer       tblinvoicedetails  inner join      tbldisclosure      on tblinvoicedetails.disclookup = tbldisclosure.id       (((tbldisclosure.payer)='client'))  order      [applicantsurname] & ', ' & [applicantforenames];

try:

=forms!frminvoice!nameofyoursubformcontrol.form!text5

replace "nameofyoursubformcontrol" name, not name of form.


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