KMC - DB migration fails (EP6->NW)

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Hi

I am migrating an SP2 portal with heavy KMC content into a NW environment. I am currently using the KMC Migration Tool (Patch 8) and I have successfully completed the first 2 steps (Reports and ETC). Now I am at step 3 (DB Migration). After pressing "Start" the tool runs for about 20 seconds, then it stops with the following exception:

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1122892441241#INFO.- Migarting Workflow data...

1122892441241#INFO.- (migrating BP_CLASSDEF)

1122892441335#INFO.- (migrating BP_CONDITION)

1122892441522#INFO.- (migrating BP_I18N_PROP)

1122892441585#INFO.- (migrating BP_ORGUNIT)

1122892441741#INFO.- (migrating BP_ORGUNIT_MEM)

1122892441991#INFO.- (migrating BP_ROLE)

1122892442038#INFO.- (migrating BP_ROLE_CRITERIA)

1122892442069#INFO.- (migrating BP_ROLE_CRITPARAM)

1122892442178#INFO.- (migrating BP_ROLE_PARAM)

1122892442241#INFO.- (migrating OBJCACHE_METADATA)

1122892442538#INFO.- (migrating OBJCACHE_METAOPS)

1122892442663#INFO.- took 563 ms to read 86609 ids

1122892442897#INFO.- (migrating OBJCACHE_SHARED)

1122892443319#INFO.- (migrating OBJCACHE_TABCOLS)

1122892443397#INFO.- migration of task RelGeneric completed after 2638 steps and 00:00:01.687 ms

1122892443913#INFO.- (migrating OBJCACHE_TYPES)

1122892444053#INFO.- (migrating WF_APPLICATION)

1122892444163#INFO.- (migrating WF_BUSINESSPROCESS)

1122892444272#ERROR.- failed to migrate task Sub: Insert Resource. RIDKEY cannot be NULL, or was too long.

Sid: 7a72d433-0401-0010-8fb1-fe91b9f2e6b5

Urikey: key=key=key=a3b601b2

Uri: /room\4extensions/cm\4stores/documents/workspaces/d0c687f8-0201-0010-32b7-acb3121ee3ee/Resources/Requests/Archive/Mockup\4BusinessCons\4Germany.xls

isCollection:

State:

Displayname: Mockup\4BusinessCons\4Germany.xls

stack:

java.lang.IllegalArgumentException: Insert Resource. RIDKEY cannot be NULL, or was too long.

Sid: 7a72d433-0401-0010-8fb1-fe91b9f2e6b5

Urikey: key=key=key=a3b601b2

Uri: /room\4extensions/cm\4stores/documents/workspaces/d0c687f8-0201-0010-32b7-acb3121ee3ee/Resources/Requests/Archive/Mockup\4BusinessCons\4Germany.xls

isCollection:

State:

Displayname: Mockup\4BusinessCons\4Germany.xls

at com.sap.netweaver.bc.migration.ui.MigrateSubscription.insertResource(MigrateSubscription.java:290)

at com.sap.netweaver.bc.migration.ui.MigrateSubscription.runMigration(MigrateSubscription.java:111)

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

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

-

Does anybody know what is causing this error, and how I can solve the problem?

Source system is EP6 SP2 Patch 31

Target system is EP6 SP9 Patch 8 with KMC Patch 3

Many thanks,

Jakob