How to fix SAP error USMD1584?

What causes this issue? The data elements you specify for entity types with internal key assignments in the data model must fulfill the following technical prerequisites: Data type: CHAR Minimum length: 6 characters Data element &V3& does not fulfill these prerequisites.System Response You cannot activate the data model.How to fix this error? In Customizing activity <DS:SIMG.FMDM_USMD001>Edit Data Model</>, specify a data element that meets these prerequisites.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.

How To Fix USMD1584 - Model &1, entity type &2: Invalid data element

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SAP Error Message - Details

Message type: E = Error
Message class: USMD1 - Datenmodel
Message number: 584
Message text: Model &1, entity type &2: Invalid data element
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What causes this issue?
The data elements you specify for entity types with internal key
assignments in the data model must fulfill the following technical
prerequisites:
Data type: CHAR
Minimum length: 6 characters
Data element &V3& does not fulfill these prerequisites.
System Response
You cannot activate the data model.
How to fix this error?
In Customizing activity <DS:SIMG.FMDM_USMD001>Edit Data Model</>,
specify a data element that meets these prerequisites.
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.

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What is the cause and solution for SAP error message USMD1584 - Model &1, entity type &2: Invalid data element ?

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