3369809 - SU21: Runtime error ITAB_LINE_NOT_FOUND appears while adding Auth field in Object

When attempting to update en Authorization object with the a field in transaction code SU21, the following dump is raised.

Category               ABAP programming error
Runtime Errors         ITAB_LINE_NOT_FOUND
Except.                CX_SY_ITAB_LINE_NOT_FOUND
ABAP Program           CL_SUSO_APPL==================CP
Application Component  BC-SEC-AUT
Date and Time          dd.mm.YYYY hh:mm:ss

Short Text

This line is not contained in the table.

Error analysis                                                                                    |
|    An exception has occurred in class "CX_SY_ITAB_LINE_NOT_FOUND". This exception                |
|     was not caught                                                                               |
|    in procedure "CHECK_FLDLIST" "(METHOD)" or propagated by a RAISING clause.                    |
|    Since the caller of the procedure could not have anticipated this                             |
|    exception, the current program was terminated.                                                |
|    The reason for the exception occurring was:                                                   |
|    The reason for the exception is:                                                              |
|    Access failed for table "ME->GT_OUT_FLD_EXT".                                                 |
|    Access method: "INDEX".                                                                       |
|    Line index (for "INDEX" access) / key name (for "KEY" access): 1.                             |
|    Key values: " " " " " " " "                                                                   |
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• SAP S/4HANA 2020
• SAP S/4HANA 2021
• SAP Business Technology Platform

SU21, authorization, object, field, dump, ABAP programming error, Runtime Errors, ITAB_LINE_NOT_FOUND, exception, CX_SY_ITAB_LINE_NOT_FOUND, ABAP Program, CL_SUSO_APPL==================CP, This line is not contained in the table, ME->GT_OUT_FLD_EXT, CL_SUSO_APPL, add, edit , KBA , BC-SEC-AUT , Authorization , Problem