3807579 - Item category TAN with down-payment process is NOT supported in Universal Revenue Recognition(URR)

Error 'Changing Value-Relevant (field VALUE_RELEVANT) from '' to 'X' is not permitted' raised due to Item category TAN with down-payment process is NOT supported in URR.
With regards to TAN, URR only supports billing after goods issue which is BD9.  

SAP S/4HANA Cloud Public Edition

The item is configured for a down-payment process (milestone billing/Advanced Down Payment processing) or was changed from a standard process to down-payment after order creation. This scenario is not supported by Universal Revenue Recognition (URR). For this item category, URR supports only billing after goods issue (BD9).

1. Verify whether the affected SD or service contract items use a down-payment/milestone billing process (for example, an advanced down payment billing plan) or were changed from a standard process to a down-payment process after order creation.
2. If yes, adjust the process to a URR-supported flow (for example, billing after goods issue/BD9) or avoid assigning a down-payment billing plan to those items. URR does not support down-payment processing for this item type in the current release.
3. If support for down-payment processing in URR is required, submit a product enhancement request via the Customer Influence site.
4. If the scenario is not down-payment-related and the issue persists, review Standalone Selling Price (SSP) and POB attribute settings, and ensure BRF+ rules are correctly maintained and regenerated so that SSP values and sources are recognized during inbound processing.

• refer to: Error “Condition Type xxxx is not assigned to a source” when processing Revenue Accounting Item
• refer to: SAP Customer Influence for SAP S/4HANA Cloud
• refer to: Configure Standalone Selling Price using pricing conditions in SAP S/4HANA

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