How To Fix AD338 - Use another data type in the pool key

AD338 - Overview

• Message type: E = Error

• Message class: AD - Data Dictionary application messages

• Message number: 338

• Message text: Use another data type in the pool key

What causes this issue?

The key of a pooled table may contain only CHAR-type data types (without
conversion): CHAR, NUMC, ACCP, CLNT, CUKY, DATS, TIMS, LANG,
UNIT.

System Response

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

How to fix this error?

Use a valid data type or remove the field from the key part.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AD338 - Use another data type in the pool key ?

  The SAP error message AD338, which states "Use another data type in the pool key," typically occurs in the context of ABAP programming when you are trying to define a key for a pooled table or a cluster table. This error indicates that the data type you are using for the key field is not compatible with the requirements for pooled or cluster tables.
  
  Cause:
  
  Incompatible Data Type: The key field in a pooled or cluster table must be of a specific data type. Commonly, the key fields should be of type CHAR, NUMC, or DATS. If you are using a different data type (like STRING, FLOAT, etc.), you will encounter this error.
  Key Field Definition: The definition of the key fields in the table may not adhere to the constraints set by SAP for pooled or cluster tables.
  
  
  Solution:
  
  Change Data Type: Review the data types of the key fields in your pooled or