The user type "substitute" cannot be a new type

Message type: E = Error

Message class: BV - Customer Measurement

Message number: 148

Message text: The user type "substitute" cannot be a new type



What causes this issue?

You have chosen "Substitute" as the new user type. However, this type
cannot be selected for a mass change as you must enter individual
information for each substitute (validity period and substituted user).

Error message extract from SAP system. Copyright SAP SE.