Question:
Why does my Vault Loader CSV fail when attempting to set my Yes/No field to TRUE, FALSE, YES, or NO?
Answer:
This is a known issue within Vault itself. When attempting to set a Yes/No document field, both with Vault Loader and with the API, users should use 'yes', 'no', 'true, or 'false' in all lowercase.
Related Documentation:
Vault Help Documentation: Known Issues for Static Reference Constraints