As a librarian exporting inventory data I would like to have records contain call number so that holdings information is appended to inventory instance records when exporting in the MARC format

Scenario 1:
Given: any field associated with the holdings call number has associated transformation
When: the inventory instance record has an inventory holdings record with populated call number
Then: the data that is stored in the holdings record is used to populate fields as specified in the transformation and the MARC fields are appended to MARC bib record

Scenario 2:
Given: any field associated with the holdings electronic access has associated transformation
When: the inventory instance record has an inventory holdings record without call number data
Then: the mapping is skipped and no fields are appended to the MARC bib record