...
API collection:
View file name mod-record-specifications.postman_collection.json The APIs do not support batch creates/updates/deletes.
APIs support CRUD of one type. For example, you can only update a field but you cannot update subfield or indicator with one API call.
Values
If repeatable = true then the field/indicator/subfield value is repeatable. If repeatable = false then the field/indicator/subfield value is nonrepeatable.
If required = true then the field/indicator/subfield value is required. If required = false then the field/indicator/subfield value is not required.
There is an API that allows you to turn off some rules globally and thus MARC validation is very similar to pre-Ramsons release. See Global MARC Validation Rules Updates
ECS support
If your ECS setup has local bib or authority records, then configuration should be set up per tenant.
Otherwise if these records will be shared then setting up configuration rules on the central tenant should be enough.
...