Hi bbs,
As i faced same issue some days back with both views V_DSH_ASSIGNED and V_DSH_TF_DETAIL and was getting SQL error like as you are getting
Retcode 1: error in DDL statement for "V_DSH_ASSIGNED " - repeat
2EETP345 20:40:56: Retcode 1: SQL-error "918-ORA-00918: column ambiguously defined" in DDL statemen
2EETP345 t for "V_DSH_ASSIGNED "
2 ETP399 --------------- DB-ROLLBACK() ---------------
2EETP334 20:40:56: error in DDL, nametab for "V_DSH_ASSIGNED" not activated
3 ETP379X20:40:56: activating Nametab "V_DSH_TF_DETAIL":
For the resolution try to find any entries in table DDXTT and if you find any entries related to views V_DSH_ASSIGNED and V_DSH_TF_DETAIL then you need to remove both the entries for there.
Also you can navigate the link for more Severe error(s) occurred in phase MAIN_NEWBAS/MVNTAB_UPG!
Thanks,
Gaurav Rana