## Description
When creating a ZWrapper, we check whether the key of a sub-object is `Z99K1` in order to avoid creating ZWrappers from the contents of a `Z99/Quote`. We should additionally validate the type of the enclosing object (i.e., that it is, indeed, a `Z99/Quote`).
**Desired behavior/Acceptance criteria (returned value, expected error, performance expectations, etc.)**
* stricter check for `Z99/Quote` in `ZWrapper.create`
---
**Remove all the non-applicable tags from the "Tags" field, leave only the tags of the projects/repositories related to this task**
---
## Completion checklist
* [ ] Before closing this task, review one by one the checklist available here: https://www.mediawiki.org/wiki/Abstract_Wikipedia_team/Definition_of_Done#Back-end_Task/Bug_completion_checklist