Requirement 1

Given a user updates a MARC bib record

When the MARC bib field is non-linkable/non-controllable

AND it contains a subfield $9 

Then retain the $9 value 

Requirement 2

Given a user updates a MARC bib record

When the MARC bib field is non-linkable/non-controllable

AND it contains multiple subfield $9 

Then retain all $9 values 

Requirement 3

When a user updates a MARC bib record

AND the MARC bib field is linked/controlled

AND contains a subfield $9 that is not the Authority UUID linked to the record 

AND $0 exist 

Then no change to current implementation which retains (does not change) the linked subfield 9.

Use cases - https://folio-org.atlassian.net/wiki/display/FOLIJET/Orchid+%3E+Subfield+9+handling

Requirement 4

When a user updates a MARC bib record

AND the MARC bib field is linkable/controllable

AND contains a subfield $9 that IS the Authority UUID linked to the record 

AND $0 does not exist 

Then no change to current implementation which is to remove link and the field is no longer controlled by an authority record. 

Requirement 5

When a user updates a MARC bib record

AND the MARC bib field is linkable/controllable

AND contains a subfield $9 that IS NOT the Authority UUID linked to the record 

AND $0 does not exist 

Then no change to current implementation which unlinks the bib field. NOTE: For Poppy will refine this requirement