How To Fix USMD1033 - Data model &1, entity type &2: Too many key fields

SAP Error Message - Details

• Message type: E = Error

• Message class: USMD1 - Datenmodel

• Message number: 033

• Message text: Data model &1, entity type &2: Too many key fields

What causes this issue?

The database tables to be generated - as well as the client - can
contain a maximum of 15 key fields. The system reserves two key fields
for edition-dependent master data. This results in the following
prerequisites for defining relationships with <LS>Leading</> or
<LS>Qualifying</> as the relationship type:
A maximum of 12 higher-level relationships with the relationship type
<LS>Leading</> (direct or indirect) can be defined for entity types with
<DS:DE.USMD_USAGE_TYPE>storage and use type</> <LS>1</>.
A maximum of 12 higher-level relationships with <LS>Leading</> or
<LS>Qualifying</> as the relationship type can be defined for entity
types with storage and use type <LS>4</>.
A maximum of 14 higher-level relationships with the relationship type
<LS>Leading</> (direct or indirect) can be defined for entity types with
storage and use type <LS>2</>.
These prerequisites are <ZH>not</> fulfilled for entity type &V2&.

System Response

The data model cannot be saved or activated.

How to fix this error?

Only define as many relationships as the prerequisites allow.

Procedure for System Administrators

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.