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#20977 import failure during mkhlink operation
When multiple imports occur simultaneously, the following error message may be displayed:
multitool: Error: Database identifier (dbid) not found in database: "VOB-tag".
...
op= mkhlink
This problem occurs when one update packet includes an operation that attempts to create a hyperlink and another packet includes an operation that removes an object at either end of the hyperlink.
Workaround: Retry the import. To prevent multiple simultaneous imports, use the sync_receive script.