Message type: E = Error
Message class:  9J1UF_UATAX - Ukrainian tax messages 
Message number: 321
Message text: Non-summary Tax Invoice exists for the document
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The SAP error message 9J1UF_UATAX321 indicates that a non-summary tax invoice exists for the document you are trying to process. This typically occurs in the context of tax-related transactions, particularly when dealing with invoices that have been processed in a way that does not align with the expected summary or aggregation of tax data.
Cause: Existing Non-Summary Tax Invoice: The error suggests that there is already a non-summary tax invoice associated with the document you are trying to create or modify. This can happen if the system has already recorded a detailed tax invoice for the same transaction. Document Type Restrictions: Certain document types may have restrictions on how tax invoices are processed, leading to conflicts when trying to create a new invoice. Data Entry Errors: Incorrect data entry or configuration settings in the tax determination process can lead to the generation of non-summary invoices when a summary invoice is expected.
Solution: Check Existing Invoices: Review
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