Clone - Excluding base TPC table doesn't exclude child tables excluding itDescriptionIssue Definition: Excluding the base TPC table doesn't exclude child tables extending it. As per the below documentation, we expect the child tables also to be excluded if the base table is excluded (TPC) https://docs.servicenow.com/csh?topicname=t_ExcludeATableFromCloning.html&version=latest While the example is for TPH, it can be easily misinterpreted because there is no mention of how TPC should behave.Steps to Reproduce 1. In the clone sources instance, create a table 'u_phase_3_ci_dups' table extending 'sys_import_set'_row. 2. Create a custom field 'u_test_column' on the new table. 3. Add 2 new records in the table4. Check from the backend and you will see the records both in parent and child table."SELECT COUNT(*) FROM u_phase_3_ci_dups" +------+----------+| Port | COUNT(*) |+------+----------+| 3556 | 2 |+------+----------+"SELECT COUNT(*) FROM sys_import_set_row where sys_class_name = 'u_phase_3_ci_dups'" +------+----------+| Port | COUNT(*) |+------+----------+| 3556 | 2 |+------+----------+ 5. Check exclude configuration in the source. OOB 'sys_import_set.*' table is excluded. No preserver for this table. 6. Request clone to any target instance7. Once the clone completes, check the count of the records in the parent and child table as we did in Step 4"SELECT COUNT(*) FROM u_phase_3_ci_dups" +------+----------+ | Port | COUNT(*) | +------+----------+ | 3491 | 2 | +------+----------+ "SELECT COUNT(*) FROM sys_import_set_row where sys_class_name = 'u_phase_3_ci_dups'" +------+----------+ | Port | COUNT(*) | +------+----------+ | 3491 | 0 | +------+----------+ Notice that the records are truncated from the base table leaving broken records in the extended table. WorkaroundCurrently this is been reported as a known issue via PRB1403259 and is being worked on by ServiceNowRelated Problem: PRB1403259