Message type: E = Error
Message class:  CA_TTE - TTE Messages 
Message number: 439
Message text: Assign quantity-based condition type to tax type &2, country &1
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
In Customizing for TTE,
Choose <DS:SIMG.TTEVCL_TXSET>Define Tax Settings</>
Choose the sub-activity <ZK>Define Tax Type</>.
Assign the condition type for quantity-based taxes to tax type  &V2&.
Choose <ZK>Save</>.
To update Customizing settings, choose <DS:SIMG.SIMG_REFRESH>Immediate
Customizing Refresh</>.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message CA_TTE439 indicates that there is an issue with the assignment of a quantity-based condition type to a tax type in a specific country. This error typically arises in the context of pricing and tax calculations in SAP, particularly when dealing with condition types that are not properly configured for the relevant tax types.
Cause: Incorrect Configuration: The condition type being used is not correctly assigned to the tax type for the specified country in the pricing procedure. Missing Assignment: The system may not have the necessary configuration to handle quantity-based conditions for the specified tax type and country. Incompatibility: The condition type may not be compatible with the tax type due to the way they are defined in the system.
Solution: Check Configuration: Go to the SAP Customizing Implementation Guide (IMG) and navigate to the relevant section for pricing and tax configuration. Verify the assignment of condition types to tax types for the specific
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CA_TTE438 Maintain tax rate ID description
What causes this issue?  The system issues an error message and will not allow you to continue with this transaction until the error is resolved. Syst...
CA_TTE437 Maintain tax rate ID for condition record &2
What causes this issue?  The system issues an error message and will not allow you to continue with this transaction until the error is resolved. Syst...
CA_TTE440 Maintain legal text ID description
What causes this issue?  The system issues an error message and will not allow you to continue with this transaction until the error is resolved. Syst...
CA_TTE441 Maintain deductibility reason
What causes this issue?  The system issues an error message and will not allow you to continue with this transaction until the error is resolved. Syst...
Click on this link to search all SAP messages.