Hi Valantis,
As you've mentioned you've done following changes
View Shipping Rules = Allowed
Create Shipping Rules Allowed
Delete Shipping Rule Inherited
Edit Shipping Rule Inherited
Activate/Deactivate Shipping Rule Inherited
But the error you are getting because of last two point
Edit Shipping Rule Inherited
Activate/Deactivate Shipping Rule Inherited
Because in your case user has only permission to create rules but unless he/she doesn't have the edit permission, won't be able to create/edit new rules.
And you've mentioned in the previous post
When a seller tries to create a new rule(his own rule) still got the error
But as of now, there is
no option to create
Own rule for a seller.
When we will add this feature, you'll see in permission says:
Create Own Shipping Rules
Delete Own Shipping Rule
Edit Own Shipping Rule
Thanks