Hi Lorenzo,
Greetings from Syncfusion support.
We suggest you to ensure you to modify your codes inside EditTemplate as like below to overcome the reported problem during saving. We suggest you to ensure to provide proper field values in @bind-Value property of component inside EditTemplate based on the Field value of GridColumn.
Please refer and modify as like the below highlighted codes,
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<GridColumn Field="Type.Description" HeaderText="Tipo">
<EditTemplate>
<SfComboBox TValue="string" TItem="ContactAgendaType" ... @bind-Value="@((context as ContactAgenda).Type.Description)" ...>
<ComboBoxFieldSettings Value="Id" Text="Description"></ComboBoxFieldSettings>
</SfComboBox>
</EditTemplate>
</GridColumn>
<GridColumn Field="Category.Description" HeaderText="Categoria" ValidationRules="@(new ValidationRules{ Required=true})">
<EditTemplate>
<SfComboBox TValue="string" TItem="ContactAgendaCategory" ... @bind-Value="@((context as ContactAgenda).Category.Description)" ...>
<ComboBoxFieldSettings Value="Id" Text="Description"></ComboBoxFieldSettings>
</SfComboBox>
</EditTemplate>
</GridColumn>
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Please get back to us if you need further assistance.
Regards,
Renjith R