Hartmut,
Are you getting any other errors? SQL errors, for instance? Also, are these the only two SP's in your queue, or are you doing others up to these? Note 822379 (Known problems with Support Packages in SAP NW 7.0x AS ABAP) mentions several known errors in the IMPORT_PROPER phase, one of which is specific to DB2, but none specific to the SP's you mention.
If nothing you see in that Note applies to your situation, then I would say you need to find a way to resolve the table lock.
Best regards,
Matt