trouble connecting 3 forms based on qry's

J

Joe

why is it that after setting up a perfectly 1 to many relationship on 3 tables, after making a query w/ all the fields of those tables, and after placing a couple of forms inside the main form (based on that primary table), I tab through to the 2nd form, and into the third and I get the error message bellow

'you can not assign a value to this object. *the object may be a control on a read-only form, *the object may be on a form that is open in Design view, or *the value may be too large for this field.'

As far as I know none of the above apply. One form works Ok, even two forms are ok, but as soon as I get to that third form I get the above error mssg

any help is most appreciated
 
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