How To Fix IST_EBS131 - Only billing type reversal &1 is from category IS-T external billing

IST_EBS131 - Overview

• Message type: E = Error

• Message class: IST_EBS - Interface Between IS-T and External Billing System

• Message number: 131

• Message text: Only billing type reversal &1 is from category IS-T external billing

What causes this issue?

The billing document type of reversal billing document &v1& is from
category <ZH>IS-T External Billing</> and the original billing document
&v2& is allocated to another type of billing document.
If you need to allocate reversal billing document type &v1& to the
<LS>IS-T External Billing category</>, you must also allocate the
original billing document type &v2& to this billing document type.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

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Error message extract from SAP system. Copyright SAP SE.

IST_EBS131 - Details

• The SAP error message IST_EBS131 indicates that there is an issue related to billing types in the context of external billing within the IS-T (Industry Solution for Telecommunications) module. Specifically, the error states that only the specified billing type reversal is allowed for the external billing category.
  
  Cause:
  This error typically occurs when:
  
  You are trying to reverse a billing document using a billing type that is not configured for external billing.
  The billing type you are using does not match the expected billing type for the reversal process.
  There may be a configuration issue in the billing type settings in the SAP system.
  
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Billing Type Configuration:
  
  Go to the configuration settings for billing types in the IS-T module.
  Ensure that the billing type you are trying to use for reversal is correctly configured for external billing. You can check this in the transaction code SPRO under:SAP Customizing