ERROR exec_ddl_stmt: (DB) ERROR: DDL statement failed during migration.

Hello Experts ,

We are in process of migration and after 90% of migration we are getting the following error as mentioned in MIGRATE_DT_XXXXX_IMP.log.:

ERROR exec_ddl_stmt: (DB) ERROR: DDL statement failed

(  ALTER TABLE "EDID4" ADD PRIMARY KEY(       "MANDT"       , "DOCNUM"       , "COUNTER"       , "SEGNUM"       ))

DbSlExecute: rc = 99

  (SQL error -10108)

  error message returned by DbSl:

ERROR exec_ddl_stmt: (DB) ERROR: DDL statement failed

(                                           ALTER TABLE "EDID4" enable persistent merge )

DbSlExecute: rc = 99

  (SQL error 131)

  error message returned by DbSl:

transaction rolled back by lock wait timeout: Lock timeout occurs while waiting TABLE_LOCK of mode EXCLUSIVE(TRANSACTION_ID=14, UPDATE_TRANSACTION_ID=1442668)

(DB) INFO: disconnected from DB

I ran r3tans -d too to check the connection but it shows "Disconnected from DB".

Can someone please let me know what went wrong.

Environment Details :

SOurce : ECC 6 Ehp5 NW702 Oracle10

Target : ECC 6 Ehp7 NW740 HANA 1.0 Rev85

Tool : SUM 1.0 SP12 PL04

Phase Name :

MAIN_SWITCH/SUBMOD_MIG_SWITCH/SUBMOD_MIG_DOWNTIME_RUN/EU_CLONE_MIG_DT_RUN

Thanks

Dev