Created attachment 4396 [details]
When I try edit the Subfield Constraints in "MARC framework" I can edit all subfields but subfield "0" does not change.
Created attachment 4518 [details] [review]
Proposed patch to allow modify subfield 0
When trying to modify the subfield "0" on a field in the
MARC subfield structure admin -> Tag xxx Subfield Constraints,
the boolean condition on liblibrarian fails for the initial "0" value.
Modified condition to allow the value "0".
Created attachment 6286 [details] [review]
Before applying the patch it was not possible to change the contents of of the "Text for librarian" field to "0." After, it is possible to set that value to "0."
QA comment: small patch, good test plan, works, passed QA
Patch pushed, please test
Included in 3.6 prior to 3.6.5.