Migration tool fails at DB Migration

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Hello:

We have tested migration tools using our developement system (5.0 SP6) as source system, and our test system (6.0 SR1 just installed)as target system and migration tools work fine with our systems.

Now we are making the same test but with our productive system (5.0 SP6) as source system and our test system (6.0 SR1 reinstalled) as target system. Now we have a problem that we don´t have before: at DBMigration phase the magration tool stops with a java error in task IdMapping migration. This is the error in the KMCMigrationTool.log:

1113227520917#INFO.- starting db migration run ...

1113227532980#INFO.- retrieved drv name: Oracle JDBC driver (version: 9.2.0.5.0)

1113227533073#INFO.- src cur ver: SP6.CC.2

1113227533073#INFO.- starting backup of configuration ...

1113227573027#INFO.- backup of configuration completed

1113227581011#INFO.- task[0]: MigrateIdMapping.properties

1113227581011#INFO.- task[1]: MigrateAppAcl.properties

1113227581011#INFO.- task[2]: MigrateAp.properties

1113227581011#INFO.- task[3]: MigrateCm.properties

1113227581011#INFO.- task[4]: MigrateRelGeneric.properties

1113227581011#INFO.- task[5]: MigrateRel.properties

1113227581027#INFO.- task[6]: MigrateAib.properties

1113227581027#INFO.- task[7]: MigrateTaskQueue.properties

1113227581027#INFO.- task[8]: MigrateSub.properties

1113227591917#ERROR.- failed to migrate task IdMapping: null

stack:

java.lang.NullPointerException

at com.sap.netweaver.bc.migration.ui.MigrateIdMapping.runMigration(MigrateIdMapping.java:34)

at com.sap.netweaver.bc.migration.ui.MigrationRunner.localRun(MigrationRunner.java:183)

at com.sap.netweaver.bc.migration.ui.MigrationRunner.run(MigrationRunner.java:35)

1113227591933#ERROR.- MigrationRunner failed: null

stack:

java.lang.RuntimeException

at com.sap.netweaver.bc.migration.ui.MigrationRunner.localRun(MigrationRunner.java:195)

at com.sap.netweaver.bc.migration.ui.MigrationRunner.run(MigrationRunner.java:35)

1113227592183#INFO.- cancel button pressed

1113227592183#INFO.- cancelling all tasks

1113227628527#INFO.- start time: Mon Apr 11 15:53:01 CEST 2005

1113227628527#INFO.- end time: Mon Apr 11 15:53:48 CEST 2005

1113227645448#INFO.- starting restore of configuration ...

1113227645448#INFO.- restoring configuration now ...

1113227706230#INFO.- configuration successfully restored

1113227706230#INFO.- db migration completed

1113227706230#INFO.- all tasks cancelled

Does anyone have any idea of what could be this error and how to fix it?

Thank you very much in advanced for your help,

Javier