As a rule decimal separator on the MS Excel side should be THE SAME as in the SAP system for each user using EasyInput!
These settings can be changed:
a) on SAP side:
From the top menu: System > User Profile > Own Data > Defaults > Decimal Notation
b) on the MS Excel side:
Settings > Advanced Settings > Switch off the use system decimal separators and enter new values.
c) In version 25X and above the regional EasyInput settings are accessible via ribbon menu: EasyInput Info > Settings > Regional. These settings should be set exactly as the settings from point a).
It is recommended not to use thousands separators on the Excel side when working with EasyInput.