diff -r 114b05d48c44 -r 10159a3d1d72 cubicweb/schema.py
--- a/cubicweb/schema.py	Fri Mar 22 17:30:09 2019 +0100
+++ b/cubicweb/schema.py	Fri Mar 22 17:29:15 2019 +0100
@@ -95,7 +95,7 @@
                       'WorkflowTransition', 'BaseTransition',
                       'SubWorkflowExitPoint'))
 
-INTERNAL_TYPES = set(('CWProperty', 'CWCache', 'ExternalUri', 'CWDataImport',
+INTERNAL_TYPES = set(('CWProperty', 'ExternalUri', 'CWDataImport',
                       'CWSource', 'CWSourceHostConfig', 'CWSession'))
 
 UNIQUE_CONSTRAINTS = ('SizeConstraint', 'FormatConstraint',