How To Fix FINS_ML_MIG004 - Material Ledger (= MLMAA-flag) is not active for the following entries:

FINS_ML_MIG004 - Overview

• Message type: E = Error

• Message class: FINS_ML_MIG - Messages for S/4HANA Material Ledger Migration

• Message number: 004

• Message text: Material Ledger (= MLMAA-flag) is not active for the following entries:

MLMAA flag (= Material Ledger active flag at plant level) has not been
set, because for instance no MARA table entry exists (for instance due
to inconsistencies or archiving) or the quantity or value indicator
entry is missing in table T134M for the corresponding valuation area.
(Relationship: MARA-MTART = T134M-MTART for specific BWKEY ).
Consequence: Corresponding xBEW(H) (= MBEW(H), EBEW(H), QBEW(H), OBEW(H)
) entries might have not been migrated (Fields LBKUM and SALK3 are
initial).
In addition, probably no Material Ledger master records have been
created in tables CKMLHD, CKMLPR, CKMLPP and CKMLCR.
The message can be ignored, if LBKUM and SALK3 are initial even in the
original xBEW(H) tables (= MBVMBEW(H)OLD, MBVEBEW(H)OLD, MBVQBEW(H)OLD,
MBVOBEW(H)OLD ) and it is not planned to use these records in the future
for logistics processes, such as goods movements.

Error message extract from SAP system. Copyright SAP SE.

FINS_ML_MIG004 - Details

• The SAP error message FINS_ML_MIG004 indicates that the Material Ledger (ML) is not active for certain entries in your system. This typically occurs during processes that require the Material Ledger to be active, such as during the migration of data or when performing certain financial transactions.
  
  Cause:
  The error arises when:
  
  The Material Ledger is not activated for the company code or plant in question.
  The entries being processed (e.g., materials, documents) are not set up to use the Material Ledger.
  The configuration settings for the Material Ledger are incomplete or incorrect.
  
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Material Ledger Activation:
  
  Go to the transaction code OBY6 (or use the path: SPRO > Financial Accounting > Financial Accounting Global Settings > Activate Material Ledger).
  Ensure that the Material Ledger is activated for the relevant company code and plant.
  
  
  
  Verify Material Master Settings:
  
  Use transaction code MM03 to check the material master records for the materials in