Missing issue title in the METS-files of issues

[andre-hohmann]

Problem

In the exported METS-files of issues, the title of the issues, as for example "01-Orchesterkonzert" or "02-Abendausgabe" is missing in the following METS and MODS elements: 

1. MODS: <dmdSec>
   mods:titleInfo/mods:title

2. METS: <mets:structMap TYPE="LOGICAL">
   LABEL

This is already described in #3634. But it was focused on the solution of the CatalogIDDigital-problem.

Solution

It is still desired, that the value in the input field does not has to be entered a second time in a metadata fields, for example "Haupttitel".
If it is possible, the value in '#issue', which is used to create the process title could be copied in a metadata field 'edition'. that could be transformed in the XSL-export-file according to the process title, which is transformed to the CatalogIDDigital, PURL, ...