X_SUBJECT_TABLE_UNDECLARED
Means
a table reaches the declared subject and defineSubject gives it no treatment
Typical cause
an entity holds a foreign key into the subject (or into a table the subject erase deletes) and tables: in defineSubject names no treatment for it — usually a table added after the subject was declared. The cause prints the reference path
Fix
tables: { <table>: 'delete' } in defineSubject — or { anonymize: { <column>: <value> } }, or { retain: '<why it is kept>' }