Unable to create new finance account in Zoho Books Android app due to missing account number field.

Unable to create new finance account in Zoho Books Android app due to missing account number field.

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I have enabled a setting via the website requiring unique account codes to be specified for all accounts. 
When using the android app, go to expenses, new expense, select account, new account. Promoted to enter the Account name and description. When tapping the Save button, am error prevents this, starting that no account number was provided, despite there being no visible field to enter one.