Tax rate maintenance is not supported in Ctry/Reg. &1, display mode only

[SAPSupport]

Tax Code Creation not possible in app Define Tax code for Sales/Purchases ID 101016 

I am unable to create new tax code as the screen is only on display mode.  Tax rate maintenance is not supported in Ctry/Reg. &1, display mode only 

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[SAPSupport · Accepted solution]

Tax Rate maintenance is only possible if the TDT (Time-Dependent Tax) solution is activated in your system.

See Time-Dependent Taxes (TDT) is available for countries Countries/Regions Where Time-Dependent Taxes Is Enabled 
https://help.sap.com/docs/SAP_S4HANA_CLOUD/0fa84c9d9c634132b7c4abb9ffdd8f06/a35c786335f3486686a36149...

 If the Country is not available for Time Dependent Tax, you should create a new case/Service Request according to the Roadmap Configure Tax Solution.

Follow link below which provides all steps for activation and creation on tax codes for countries for where time-dependent taxes is enabled. 

https://help.sap.com/docs/SAP_S4HANA_CLOUD/0fa84c9d9c634132b7c4abb9ffdd8f06/8fd78f3974b84e478dc99ae1...

see referenced in link Defining Tax Codes for Time-Dependent Taxes https://help.sap.com/docs/SAP_S4HANA_CLOUD/0fa84c9d9c634132b7c4abb9ffdd8f06/f2f57100c15a447faa7d3a78...

"When time-dependent tax calculation (TDT) is active, you can maintain tax codes, rates, and tax code properties.

Once time-dependent tax calculation (TDT) is active for a target country/region, you can use the Define Tax Codes for Sales and Purchases configuration activity to maintain tax rates and tax codes."

see documentation in full. 

See also  kbas
2936931 - TDT S/4HANA Cloud
3171265 TDT activation status for Country/Region &1 is different in production in 3-System Landscape

See also help.sap.com documentation on System Landscape and Transport Management

https://help.sap.com/docs/SAP_S4HANA_CLOUD/0f69f8fb28ac4bf48d2b57b9637e81fa/6a1d1cd2e9a848dfb9c45a46...