Problem solved
I found the solution, just re-insert the subform again using the wizard. That seems to magically solve the problem. Thanks for the requery tip anyhow.
In the zip-file attached below is my "problem" database. (to see the problem open frmLedenArtikels)
On top of the form just select a name from the combo box, the subform then lists the items that person has bought on a certain date. So very easy form.
The problem is the following. When I try...
Well, placing a second "undo" button is indeed an option, but if it possible I would prefer to have only one "Undo button" since for the user the form is just one form and it looks quite strange to have two undo buttons. However, thanks for the suggestion.
I have a main form, on the footer of the form I place the famous "Undo" button. So, in case people want to reconsider and undo their typing, a user can press this button.
My question, is it possible that this undo button also does it's job on a subform that is positionned on the main form...