Message type: E = Error
Message class:  TXS_MESSAGES - Tax Service Messages class 
Message number: 066
Message text: The pre-configured master data of your One-Time Customer is not found.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Check the master data of your One-Time Customer.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message TXS_MESSAGES066 indicates that the system is unable to find the pre-configured master data for a One-Time Customer. This typically occurs when you are trying to create a transaction involving a One-Time Customer, but the necessary master data has not been set up or is missing.
Cause: Missing Master Data: The One-Time Customer master data has not been created or is incomplete in the system.
Configuration Issues: The configuration settings for One-Time Customers may not be properly set up in the system. Data Transfer Issues: If data was recently migrated or transferred, there may have been issues that led to the loss of the One-Time Customer data. Authorization Issues: The user may not have the necessary authorizations to access the One-Time Customer data.
Solution: Create One-Time Customer Master Data: Navigate to the relevant transaction (e.g., FD01 for creating customer master data). Ensure that you create a One-Time Customer by selecting the appropriate settings. Fill in all required
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