How To Fix DA661 - Non-supported type change for table &1

DA661 - Overview

• Message type: E = Error

• Message class: DA - Dictionary: Compare, distribution, timer, instantiation

• Message number: 661

• Message text: Non-supported type change for table &1

Self-Explanatory Message

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DA661 - Details

• The SAP error message DA661, which states "Non-supported type change for table &1," typically occurs when there is an attempt to change the data type of a field in a database table that is not allowed due to various constraints. This can happen during a modification of a table structure, such as when you are trying to change a field from one data type to another that is incompatible.
  Causes:
  
  Incompatible Data Type Change: The most common cause is trying to change a field's data type to one that is not compatible with the existing data or structure.
  Foreign Key Constraints: If the field is part of a foreign key relationship, changing its type may violate referential integrity.
  Data Dictionary Restrictions: SAP has certain restrictions on how data types can be changed in the Data Dictionary (DDIC).
  Existing Data: If there is existing data in the table that cannot be converted to the new data