Validator in ListView causing the Insert command to fail

Question

Hi,

I have an asp.net ListView that has an insert item template. In there I have a couple of textboxes that perform validation. When I click the "Save" button the inputs are validated but when I correct the validation errors I can´t click the "Save" button or the "Cancel" button. I have validation groups on the textboxes, the validators, and the button (the cancel has it set to false). I can´t see what is causing this.

The code looks something like this:

<InsertItemTemplate>
...
<asp:TextBox runat="server" ID="ArticleEANTextBox"
                                    ValidationGroup="InsertItemTemplate"
                                    CssClass="typetext" 
                                    MaxLength="13" />

                         <asp:RequiredFieldValidator runat="server" 
                                ControlToValidate="ArticleEANTextBox"
                                ErrorMessage="Please fill in"
                                ValidationGroup="InsertItemTemplate" />
.....

                            <asp:LinkButton runat="server"
                                ValidationGroup="InsertItemTemplate"
                                Text="Save" 
                                CommandName="Insert" />
                            <asp:LinkButton runat="server"
                                CausesValidation="false"
                                Text="Cancel"
                                CommandName="Cancel" />

Any ideas...?