How To Fix AJ031 - System expects &1 line item types; actual number: &2

AJ031 - Overview

• Message type: E = Error

• Message class: AJ - Billing program

• Message number: 031

• Message text: System expects &1 line item types; actual number: &2

What causes this issue?

The variant program expected a certain number of document line item
types. However, the number of document line item types actually defined
for this variant differs from the expected number.

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?

Check how many document line item types have been defined for the
relevant item using transaction EA88.
Also check in rate whether the number of document line item types
defined for this variant matches the expected number.
If everything matches the expected number, then an error has probably
occurred in the billing program.
Otherwise the setting in the system tables for variants is either
incorrect, or the setting changed without the necessary changes being
made in the rate or variant.
In any case, report this error to SAP.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AJ031 - System expects &1 line item types; actual number: &2 ?

  The SAP error message AJ031 indicates a mismatch between the expected number of line item types and the actual number present in a transaction or document. This error typically occurs in the context of financial postings, particularly in the area of asset accounting or when dealing with line items in financial documents.
  
  Cause:
  The error message AJ031 is triggered when the system expects a certain number of line item types (for example, different categories of transactions such as asset acquisition, depreciation, etc.) but finds a different number of line item types in the document being processed. This can happen due to:
  
  
  Configuration Issues: The configuration settings for the asset accounting module may not align with the actual transactions being processed.
  Data Entry Errors: Incorrect or incomplete data entry when creating or modifying financial documents.
  Custom Development: If there are custom programs or enhancements that manipulate line items, they may not adhere to the expected structure.
  Missing