[tryton] Creation of a custom chart of accounts fails - how to locate error

[kostas]

Dear tytonistas,

I have created a custom chart of accounts as a tryton module (I use tryton 
3.0.3). 
The template gets installed successfully but when I try to create the chart 
of accounts using this template, I get the error message 
'domain_validation_error' and the creation fails. 
Can you suggest a way to locate where the error is ?

Thanks