is the underlying recordset updateable
is it a query or table
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...I want both the main form and sub-form to have data-entry...
First, you do understand, do you not, that having Data Entry set to 'Yes' is not necessary in order to Add/Edit Records, correct? Data Entry, set to 'Yes,' allows you to only Add New Records. Adding Records only requires that the Recordset be updatableand having the AllowAdditions Property set to 'Yes.
Secondly, it sounds as if your Main Form is Read-Only. Is it based on more than one Table? Many multi-table Queries are Read-Only. For the reasons have a look at Allen Browne's article on the subject:
I'm confused as to exactly what you're doing with the Subform, as you have no Controls on it! Is this a Template that you downloaded and are trying to modify? Unless you have a specific reason for using a Continuous Form, you can get rid of the graphics by simply changing the Form the Subform is based on to a Datasheet View Form.