https://userapps.support.sap.com/sap/support/knowledge/en/3746460
3746460 - Is RTBC supported in IES scenarios? | SAP Knowledge Base Article
Is Real time budget check (RTBC) supported for IES (2NV/ 3EN) use cases?
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https://userapps.support.sap.com/sap/support/knowledge/en/3176877
3176877 - Which parameter is needed for Real Time Budget Check (RTBC) to start working in...
Which parameter is needed for Real Time Budget Check (RTBC) to start working in requisitions?