How To Fix AJ851 - Cannot uniquely determine primary inst. billing order for sec. inst.

AJ851 - Overview

• Message type: E = Error

• Message class: AJ - Billing program

• Message number: 851

• Message text: Cannot uniquely determine primary inst. billing order for sec. inst.

What causes this issue?

The system could not uniquely determine the billing order of the
<DS:DE.MAININST>primary installation</> for the secondary installation
billing order with the key (installation, scheduled billing
date, billing transaction) = &v1& and the
<DS:DE.E_ZUORDDATABR>allocation date</> &v2&.

System Response

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

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

AJ851 - Details

• The SAP error message AJ851, which states "Cannot uniquely determine primary inst. billing order for sec. inst.," typically occurs in the context of billing processes, particularly when dealing with secondary instances in a billing order. This error indicates that the system is unable to identify a unique primary instance billing order for the secondary instance, which can lead to issues in processing billing documents.
  Causes:
  
  Multiple Primary Instances: There may be multiple primary instances associated with the secondary instance, leading to ambiguity in determining which one should be used.
  
  Configuration Issues: Incorrect configuration in the billing setup or master data can lead to the system being unable to determine the correct primary instance.
  Data Inconsistencies: Inconsistencies in the billing order data or related master data can cause the system to fail in identifying the correct primary instance.
  Missing Relationships: The relationships between primary and secondary instances may not be properly defined in the system.
  
  Solutions:
  
  Check Configuration: