How To Fix DDACT040 - Function field cannot be changed (&: type with length &/&, no key field)

DDACT040 - Overview

• Message type: E = Error

• Message class: DDACT - Messages for Activating Dictionary Objects

• Message number: 040

• Message text: Function field cannot be changed (&: type with length &/&, no key field)

What causes this issue?

You have changed the field TIMESTMP without permission.,,,,

System Response

The table cluster is not activated.

How to fix this error?

The field must not be a key field. It must be of the type CHAR and must
have a length of 14 or 46 characters.
New table clusters are created, as of Release 7.00, with a TIMESTMP
field of length 46. In already existing table clusters, this field has a
length of 14. If the field was created with a length of 46, subsequent
change to 14 is no longer possible.
Define the table in the field TIMESTMP with the allowed properties.

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

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

DDACT040 - Details

• The SAP error message DDACT040 indicates that there is an issue with a function field in a data dictionary object, specifically that the field cannot be changed because it is defined as a non-key field with a specific type and length. This error typically arises when you attempt to modify a field in a way that is not allowed by the data dictionary's constraints.
  
  Cause:
  
  Field Type and Length: The field you are trying to change has a specific data type and length that cannot be altered. This is often the case for fields that are part of a structure or table definition.
  Non-Key Field: The field in question is a non-key field, meaning it does not participate in the primary key of the table or structure. Changes to non-key fields can be restricted based on the context in which they are used.
  Data Dictionary Constraints: The SAP data dictionary has certain rules and