You can turn on or turn off the invoice type option that allows changing invoice date in the mobile app.
On the Company tab, click Invoice Types, and then on the Invoice Types page, click Edit next to the appropriate invoice type.
In the Invoice Type dialog box, click to select or clear the Allow Edit Date check box, and then click OK.
If the Allow Edit Date check box is selected, you can change the invoice date in the mobile app, if the Allow Edit Date check box is not selected, the invoice date is read-only.