[Koha] leave blank for auto calc during registration

[Michael Kuhn]

Hi Joseph

> My Koha system will not auto-generate borrowernumber. > I have updated to the latest version 17.05.03.000.> autoMemberNum is 
set to "do>> Is there a log that would show me what is not happening?> 
If you could please point me in the right direction.

You're maybe experiencing bug 
https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=18636 (Can not 
save new patron on fresh install (Conflict between autoMemberNum and 
BorrowerMandatoryField))

You will find some hints there.

Hope this helps.

Best wishes: Michael
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