How To Fix TPDA310 - Only simple data types can be displayed in the SY variable field

SAP Error Message - Details

• Message type: E = Error

• Message class: TPDA - Debugger

• Message number: 310

• Message text: Only simple data types can be displayed in the SY variable field

What causes this issue?

The system field display that is
available in the upper right area of the new
Debugger allows you to enter your own field names in the lower field.
The purpose of this is to enable you to freely select a system field
(that is not the default SY-TABIX) and then monitor it.
However, you can generally only use fields with a simple type
(C,N,D,T,I,P,F) in this field.

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?

Select a simple field for the system field display.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.