No data maintained for standard communication type '&'

What causes this issue?

No communication addresses are maintained for the specified standard
communication type.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Maintain communication addresses for the selected standard communication
type, or choose a standard communication type for which data is
maintained.
If there are no communication addresses and you cannot or do not want to
maintain any, choose 'LET' (letter) as standard communication type.
INCLUDE 'ADDR_CUSTOMIZED_MESSAGE' OBJECT DOKU ID TX

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.