2531672 - DT281 Table name does not lie in valid namespace in REPACHK1/REPACHK2 phase

Inactive customer dictionary objects were found in phase REPACHK1 or REPACHK2 during an upgrade.

If checked in SE11, the following error is displayed:

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Table name /<namespace>/<object_name> does not lie in valid namespace
Message No. DT281

Diagnosis
You used a table name which does not lie in a valid namespace.

System Response
Activation of the table is rejected.

Procedure
Choose another table name.

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SAP NetWeaver

DT281, does not lie in valid namespace, REPACHK1, REPACHK2, inactive customer objects, inactive customer objects have been found, V_TRNSPACE, namespace DT 281, SM30, reserving namespace , KBA , BC-DWB-DIC-AC , ABAP Dictionary Activation and Conversion , BC-UPG-TLS-TLA , Upgrade tools for ABAP , BC-CTS-ORG , Workbench/Customizing Organizer , XX-SER-DNSP , Development Namespaces for Customers and Partners , Problem