EG88 - No devices found for specified variant

Dear all,

I have a problem with creating periodic replacement list (EG88). Every time I create a variant, it says that "No Devices found for specified variant".

I have a few devices certified and installed in the grid, certification year of those devices is 2014 and next replacement year is 2019.

In Periodic Replacement List I put 2019 as periodic replacement Year and assign a range of devices, but result is empty list.

Could you please help me with some advice, how to set correct parameters for EG88, and what could be the problem for empty list ("No devices found for specified variant")?

Thank you