Dynamics F&O doesn't allow you to register the same code more than once, but by checking the legislation it is possible to have the same service code for a different income code.

Inventory management > Setup > Fiscal information > Service code.

Example:

Service code 1.07 - Income code: 15099

Service code 1.07 - Income code: 17099

Error: Cannot create a record in Service code (TaxServiceCode_BR).

Service code: 1.07, Serviço. The record already exists.

Service code: 1.07, teste. The record already exists.