How To Fix USMD1109 - Data model &1, entity type &2: Relationship &3 was removed

SAP Error Message - Details

• Message type: E = Error

• Message class: USMD1 - Datenmodel

• Message number: 109

• Message text: Data model &1, entity type &2: Relationship &3 was removed

What causes this issue?

Removing relationships with the relationship type <LS>Leading</> or
<LS>Qualifying</> is not allowed, since it causes key fields to be
deleted in the generated database tables. You can remove other
relationships, however.

System Response

If you have tried to remove a relationship with <LS>Leading</> or
<LS>Qualifying</> as the relationship type, there is a loss of data when
the database tables are regenerated.
If you have tried to delete another relationship, the corresponding
non-key field is deleted from the generated database table. The data in
the non-key field is lost.

How to fix this error?

Check if there is already master data stored in the generated database
tables.
Check if the relationship you want to remove is a <LS>Leading</> or
<LS>Qualifying</> relationship.

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.