[Koha] stack number cannot be stored in Koha 21.05

[Michael Kuhn]

Hi Katrin

 > 952$j is mapped to items.stack by default that has the datatype
 > tinyint(1) in the database. A common problem I have encountered here
 > is that it won't save when you try to store something non-numeric or
 > outside the range of tinyint. Could that be the issue?

Yes, this would indeed be a problem... Thank you very much for the hint!

Our library was working with Koha 18.11 before - where it was possible 
to store content like "m011577".

Looking into http://schema.koha-community.org/18_11/tables/items.html 
shows that in this version the datatype was BIT(0) which seems to mean 
mean "tinyint". In my Koha 21.05 demo installation I see it actually is 
"tinyint".

However when asking the actual Koha 21.05 library database the datatype 
is given as "varchar"!

So it seems like someone has unscrupulously changed the datatype of this 
field in the past (a very bad idea). But then again - shouldn't the 
database accept value "m011577" when the datatype is "varchar"? At least 
in Koha 18.11 it seems to have worked.

I was able to successfuilly insert "011577". But not "m011577". Is there 
maybe a script that checks if the values are of the correct datatype 
when trying to store anything in the database? Maybe the guy responsible 
for this problem also changed the datatype in such a script?

Best wishes: Michael
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