How To Fix CNV_DMC_MC_EXCEPTION121 - Data type &1 is not compatible with data type &2 of domain &3

CNV_DMC_MC_EXCEPTION121 - Overview

• Message type: E = Error

• Message class: CNV_DMC_MC_EXCEPTION - Exception texts of Migration Object Modeller

• Message number: 121

• Message text: Data type &1 is not compatible with data type &2 of domain &3

The data type of the fixed value must be compatible with the data type
for the domain. Currently, they are not compatible (the data types and
lengths are not the same):
Data type and length of fixed value <(>&<)>1: CHAR, 6
Data type and length for domain <(>&<)>2: CHAR, 4

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_DMC_MC_EXCEPTION121 - Data type &1 is not compatible with data type &2 of domain &3 ?

  The SAP error message CNV_DMC_MC_EXCEPTION121 indicates a data type mismatch during a data migration or conversion process. Specifically, it suggests that the data type of a source field (denoted as &1) is not compatible with the data type of the target field (denoted as &2) associated with a specific domain (denoted as &3). This error typically occurs in the context of data migration projects, such as those involving SAP S/4HANA migrations or other data transformation tasks.
  Cause
  The primary causes of this error include:
  
  Data Type Mismatch: The source data type does not match the expected target data type. For example, trying to migrate a character field to a numeric field.
  Domain Constraints: The domain associated with the target field may impose specific constraints that the source data does not satisfy.
  Inconsistent Data: The source data may contain values that are not valid for the target data type, leading to conversion issues.
  
  Configuration Issues: Incorrect configuration