When you send a measurement from a Disto to Modus by pressing the Bluetooth button the measurement is transferred but you then receive a "240" error on the Disto.
This can happen if the Disto is in "2nd layer mode", that is, you have pressed the 2nd button on the Disto.
Get out of "2nd layer mode" when taking/sending measurements to Modus.
When the Disto is in "2nd layer mode" the Disto communicates differently with desktop applications. In this case it expects confirmation of the data sent. Since Modus is not expecting this, it does not send confirmation back to the Disto which results in the error 240.
You can tell if the Disto is in "2nd layer mode" by looking for a the "2nd" symbol on the Disto display. If you see a "2nd" on the display then you are in "2nd layer mode". Press the "2nd" button on the keypad to toggle the "2nd layer mode" on and off.
This behavior is by design.
This behavior has been reproduced on the latest Disto D330i. It also exists on previous Disto models with Bluetooth.