Only standard, sorted and hashed tables are allowed for RFC

What causes this issue?

Complex data types are allowed with RFC as IMPORTING and EXPORTING
parameters, but only those table types whose access mode is defined as
'Standard', 'Sorted' or 'Hashed' are supported. You chose a different
access 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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.