I got above error when I select the company and account in the customer.
I am using V 11.1.14
thanks for sharing. There are some issues in v11 regarding multi-company, e.g. Unable to switch between companies on chart of accounts (V11) ¡ Issue #16958 ¡ frappe/erpnext ¡ GitHub. I am not sure if this is related, though. âThe resource you are looking for is not availableâ with Company None makes sense, it checks for a company None, which does not existâŚ
I have tried to reproduce this in a ERPNext: v11.1.18, and it allows me to save. Maybe try to upgrade?
Take a look at âGlobal Defaultsâ, see if âDefault Companyâ has a value, shouldnât be blank.