How To Fix SDDL_PARSER_MSG239 - The type of the child entity "&1" is not supported in compositions

SAP Error Message - Details

• Message type: E = Error

• Message class: SDDL_PARSER_MSG - Message Class for DDL Parser

• Message number: 239

• Message text: The type of the child entity "&1" is not supported in compositions

What causes this issue?

The type of the child entity is not supported. A child entity can be one
of the following:
CDS view
Table function
Abstract entity
Custom entity

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

Error message extract from SAP system. Copyright SAP SE.