Is there a way to auto generate 001 fields in Koha?

We already have numbers that came in with uploaded records from our old database.
Anything we download will likely have a control number  from the original cataloguing agency - which I'm thinking of modifying by adding a letter prefix, so it can't possibly duplicate what we've already got in the system.  

But what about original cataloguing?  I'd hate to think we just have to guess. . . 
Just off the top of my head, using YYYYMMDD followed by a two digit sequential number should do the trick. But it would be a lot easier if something like that could be auto generated.  It's unlikely we would ever have more than one person cataloguing at once, but one never knows.

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Elaine Bradtke
Data Wrangler
VWML
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"Writing about music is like dancing about architecture"
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