How To Fix DDLS151 - As a minimum, the base objects (&) return double fields

SAP Error Message - Details

• Message type: E = Error

• Message class: DDLS - For DDL source handling

• Message number: 151

• Message text: As a minimum, the base objects (&) return double fields

What causes this issue?

In the field list, columns of at least the named base objects appear
several times through the use of the extension statement $EXTENSION.* or
$EXTENSION.<(><<)>table name>

System Response

The view cannot be activated.

How to fix this error?

The extension statement takes the fields of the attached appends from
all the base tables. The fields of the view appends are adopted from the
base views. It may be possible for you to deleted fields from the
appends. Afterwards, activate the DDL source again.

Procedure for System Administrators

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 DDLS151 - As a minimum, the base objects (&) return double fields ?

  The SAP error message DDLS151 indicates that there is an issue with the data types of the fields in a database table or view definition. Specifically, it suggests that the base objects (like tables or views) that are being referenced must return double fields (i.e., fields of type FLOAT or DOUBLE), but they do not.
  Cause:
  
  Data Type Mismatch: The error typically arises when a field that is expected to be of type FLOAT or DOUBLE is defined as a different type (e.g., INT, CHAR, etc.) in the underlying database objects.
  View Definition: If you are working with a view that combines multiple tables, one or more of the tables may not have the correct data type for the fields being used in the view.
  Inconsistent Definitions: If there are changes in the underlying tables or views that have not been reflected in the definitions of the objects that depend on them, this can lead to this error.
  
  Solution:
  
  Check Data Types: Review the definitions of the base objects (tables or views) to ensure that the fields in question are defined as FLOAT or DOUBLE. You can do this by using transaction codes like SE11 (Data Dictionary) to view the structure of the tables.
  Modify Data Types: If you find that the data types are incorrect, you may need to modify the data type of the fields in the base objects to FLOAT or DOUBLE. This may require careful consideration of the impact on existing data and applications.
  Adjust View Definitions: If the error is occurring in a view, ensure that the view is correctly defined to reference the appropriate fields from the base tables. You may need to adjust the view definition to ensure compatibility.
  Re-activate Objects: After making changes, you may need to re-activate the affected database objects (tables, views) to ensure that the changes take effect.
  Check for Dependencies: If the objects are part of a larger application or system, check for any dependencies that may be affected by the changes you make.
  
  Related Information:
  
  Transaction Codes: Use SE11 to view and modify table definitions, SE14 for database utility, and SE80 for object navigation.
  Data Dictionary: Familiarize yourself with the SAP Data Dictionary, which provides information about the data types and structures used in the system.
  Documentation: Refer to SAP documentation or help resources for more detailed information on data types and their usage in ABAP and database definitions.
  
  If you continue to experience issues after following these steps, consider reaching out to your SAP Basis or ABAP development team for further assistance.