Message type: E = Error
Message class:  FKKBIX2 - Billing in Contract Accounts Receivable and Payable 
Message number: 035
Message text: Posting document not prepared for accruals/deferrals postings
The billing document is not prepared for the
<DS:DE.BIT_IFCOMP_REVENUE_REC_KK>revenue accruals/deferrals</>.
The system issues a warning message.
Add the necessary fields to the billing document.
Specify the required enhancement with transaction FKKINV_ENH_REVREC.
INCLUDE FICA_NA_CUST_2 OBJECT DOKU ID TX
The fields for revenue accruals/deferrals are listed in structure
FKKINVBILL_S_ENH_REVREC.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message FKKBIX2035, which states "Posting document not prepared for accruals/deferrals postings," typically occurs in the context of financial accounting and is related to the handling of accruals and deferrals in the system. This error can arise during the posting of documents that are expected to be processed as accruals or deferrals but are not set up correctly in the system. Causes: Document Type Configuration: The document type used for the posting may not be configured to allow accruals/deferrals. Each document type in SAP can have specific settings that determine how it behaves in terms of posting. Missing Accrual/Deferral Indicators: The posting document may lack the necessary indicators or settings that specify it should be treated as an accrual or deferral. Account Configuration: The accounts involved in the posting may not be set up to handle accruals/deferrals. For example, the account may not be marked as an accrual account in the chart
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