In db/import-tmpl and db/import add in item_db.yml
Body:
- Id: 30000
AegisName: Zeny
Name: Zeny
Type: Etc
Weight: 1
- Id: 30001
AegisName: Cash
Name: Cash
Type: Etc
Weight: 1
If not resolved. create a file called item_db_ex.yml and add it inside and put it in db/import-tmpl and db/import.
I had the same problem and after doing that it fixed it.