Message type: E = Error
Message class:  FKK_ID_XX_SAFT - SAFT message 
Message number: 047
Message text: Contract account category is not specified
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
To identify self-billing invoices, we recommend that you specify the
contract account category in this Customizing activity under <LS>Define
Extraction Rules: Self-Billing</> instead of specifying individual
business partners, contract accounts, or contracts under <LS>Rules for
Self-Billing: Additional Parameters</>.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message FKK_ID_XX_SAFT047 indicates that the contract account category is not specified in the context of a financial transaction or process related to contract accounts in the SAP system. This error typically arises in the SAP Convergent Charging or Contract Accounts Receivable and Payable (FI-CA) modules.
Cause: Missing Configuration: The contract account category may not be defined in the system configuration. This can happen if the necessary settings for contract account categories have not been completed. Incorrect Data Entry: The user may have entered data incorrectly, leading to the system not being able to identify the contract account category. Master Data Issues: The master data for the contract account may be incomplete or incorrectly maintained, leading to the absence of a specified category. Custom Development: If there are custom developments or enhancements in the system, they may not be handling the contract account category correctly.
Solution: Check Configuration: Navigate to the configuration settings for contract accounts
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
FKK_ID_XX_SAFT046 Specify at least one of the additional parameters
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
FKK_ID_XX_SAFT045 Data source &1 is not supported by FI-CA framework implementation
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
FKK_ID_XX_SAFT048 Combination &1 is already used (first conflict only)
What causes this issue?  You have tried to create a new extraction rule using a combination of document types, origin keys, and contract account categ...
FKK_ID_XX_SAFT049 Combination &1 is already used (first conflict only)
What causes this issue?  You have tried to create a new extraction rule using a combination of document types, origin keys, division, main transaction...
Click on this link to search all SAP messages.