[Koha] Sorting order in Koha result list

[Michael Kuhn]

Hi

We're using Koha 18.11.04, having biblio records including the correct 
numbering in MARC 245 $n as well as in 773 $8:

  ...
  245 10 _aMethods in enzymology
         _n199
         _pCumulative subject index - Vol. 168-174, 176-194
  ...
  773  8 _w38
         _8199
  ...

When sorting a result list in staff client or OPAC by "Title (A-Z)" we 
get an order like the following:

  Methods in enzymology : 227 : Metallobiochemistry - Part D
  Methods in enzymology : 224 : Molecular evolution : producing the 
biochemical data
  Methods in enzymology : 217 : Recombinant DNA - Part H
  Methods in enzymology : 216 : Recombinant DNA - Part G
  Methods in enzymology : 214 : Carotenoids - Part B
  Methods in enzymology : 230 : Guide to techniques in glycobiology
  Methods in enzymology : 199 : Cumulative subject index - Vol. 168-174, 
176-194
  Methods in enzymology : 235 : Bacterial pathogenesis - Part A

But we would want:

  Methods in enzymology : 199 : Cumulative subject index - Vol. 168-174, 
176-194
  Methods in enzymology : 214 : Carotenoids - Part B
  Methods in enzymology : 216 : Recombinant DNA - Part G
  Methods in enzymology : 217 : Recombinant DNA - Part H
  Methods in enzymology : 224 : Molecular evolution : producing the 
biochemical data
  Methods in enzymology : 227 : Metallobiochemistry - Part D
  Methods in enzymology : 230 : Guide to techniques in glycobiology
  Methods in enzymology : 235 : Bacterial pathogenesis - Part A

Is there a way to teach Koha/Zebra to sort according to MARC 245 $a, and 
then according to MARC 245 $n?

Best wishes: Michael
-- 
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