Repair fails with Error ORA-1400 calling OCIStmtExecute (4301891)

The following errors are observed in the compare client log on target (sp_declt log) when repair errors out:

declt    2016-09-15 17:59:09.063055 9260 1796302688 Oracle Error 1400: ORA-01400: cannot insert NULL into ("OWNER"."TABLE_NAME"."COLUMN_NAME")

declt    2016-09-15 17:59:09.063055 9260 1796302688

declt    2016-09-15 17:59:09.102346 9260 1796302688 Error ORA-1400 calling OCIStmtExecute (de_repair_insert,L2346)

declt    2016-09-15 17:59:09.102379 9260 1796302688 No further repairs will be applied

declt    2016-09-15 17:59:09.102403 9260 1796302688 Error 1 calling de_repair_insert in de_compare_insert_server_rows (224)

declt    2016-09-15 17:59:09.102436 9260 1796302688 Continuing to process so all the out-of-sync rows are reported

declt    2016-09-15 17:59:09.181752 9260 1796302688 Error -1 calling de_compare_client (main,L2578)

declt    2016-09-15 17:59:09.181752 9260 1796302688 Exiting