Sometimes users working in the Accounting database would like to change their login, which is their email address to a simple one (for E.g. User)

Unfortunatelly it not possible due to Accounting Configuration of the database.
1) Authorization in the Accounting database is possible only via email.
2) Recovery is possible only via email.
If entering email address is particularly difficult, we recommend using a Password Manager.
This way, all passwords will be in one secure place.