If the customer specific logic is too complex to be covered by the embedded formula in calculated field editor in AET, for example there are some ABAP coding involved, we can try custom behavior logic provided by AET:

(1) Create a new entry in table AXT_BEHAVIOR

(2) Your custom behavior could be implemented in class ZCL_AXT_CUSTOM_BEHAVIOR, which inherites from class CL_AXT_ABST_BEHAVIOR_HDLR.

Source code for ZCL_AXT_CUSTOM_BEHAVIOR:

class ZCL_AXT_CUSTOM_BEHAVIOR definition
  public
  inheriting from CL_AXT_ABST_BEHAVIOR_HDLR
  final
  create public
  shared memory enabled .
public section.
  methods IF_AXT_BEHAVIOR_HANDLER~GET_BEHAVIOR_TYPE
    redefinition .
  methods IF_AXT_BEHAVIOR_HANDLER~GET_COMPATIBLE_DATATYPES
    redefinition .
  methods IF_AXT_BEHAVIOR_HANDLER~IS_SUPPORTED
    redefinition .
  methods IF_AXT_DATATYPE_HANDLER~ADJUST_GET_P
    redefinition .
  methods IF_AXT_DATATYPE_HANDLER~ADJUST_SET
    redefinition .
protected section.
  PRIVATE SECTION.
*"* private components of class ZCL_AXT_CUSTOM_BEHAVIOR
*"* do not include other source files here!!!
ENDCLASS.
CLASS ZCL_AXT_CUSTOM_BEHAVIOR IMPLEMENTATION.
* <SIGNATURE>---------------------------------------------------------------------------------------+
* | Instance Public Method ZCL_AXT_CUSTOM_BEHAVIOR->IF_AXT_BEHAVIOR_HANDLER~GET_BEHAVIOR_TYPE
* +-------------------------------------------------------------------------------------------------+
* | [<-()] RV_BEHAVIOR_TYPE               TYPE        AXT_FIELD_BEHAVIOR_TYPE
* +--------------------------------------------------------------------------------------</SIGNATURE>
  METHOD IF_AXT_BEHAVIOR_HANDLER~GET_BEHAVIOR_TYPE.
    rv_behavior_type = 'ZAXT_BEHAVIOR'.
  ENDMETHOD.                    "IF_AXT_BEHAVIOR_HANDLER~GET_BEHAVIOR_TYPE
* <SIGNATURE>---------------------------------------------------------------------------------------+
* | Instance Public Method ZCL_AXT_CUSTOM_BEHAVIOR->IF_AXT_BEHAVIOR_HANDLER~GET_COMPATIBLE_DATATYPES
* +-------------------------------------------------------------------------------------------------+
* | [<-()] RT_DATATYPES                   TYPE        AXTT_FIELD_DATA_TYPE
* +--------------------------------------------------------------------------------------</SIGNATURE>
  METHOD IF_AXT_BEHAVIOR_HANDLER~GET_COMPATIBLE_DATATYPES.
    APPEND 'CHAR' TO rt_datatypes.
    APPEND 'STRING' TO rt_datatypes.
  ENDMETHOD.                    "IF_AXT_BEHAVIOR_HANDLER~GET_COMPATIBLE_DATATYPES
* <SIGNATURE>---------------------------------------------------------------------------------------+
* | Instance Public Method ZCL_AXT_CUSTOM_BEHAVIOR->IF_AXT_BEHAVIOR_HANDLER~IS_SUPPORTED
* +-------------------------------------------------------------------------------------------------+
* | [--->] IT_BO_PART                     TYPE        AXTT_EXT_BO_PART(optional)
* | [--->] IT_SUPPORTED_UI_FRAMEWORKS     TYPE        AXTT_UI_FRAMEWORK(optional)
* | [--->] IV_EXTENSION_TYPE              TYPE        AXT_EXTENSION_TYPE
* | [--->] IV_BOL_REGISTERED              TYPE        AXT_BOOLEAN (default =ABAP_TRUE)
* | [--->] IV_RENDERING_TABLE_ONLY        TYPE        AXT_BOOLEAN (default =ABAP_FALSE)
* | [--->] IV_RENDERING_TABLE_POSSIBLE    TYPE        AXT_BOOLEAN (default =ABAP_TRUE)
* | [--->] IV_TRANSIENT_CALCULATE_SET     TYPE        AXT_BOOLEAN (default =ABAP_FALSE)
* | [--->] IV_MANUAL_DATA_ELEMENT_SET     TYPE        AXT_BOOLEAN (default =ABAP_FALSE)
* | [<-()] RV_SUPPORTED                   TYPE        AXT_BOOLEAN
* +--------------------------------------------------------------------------------------</SIGNATURE>
method IF_AXT_BEHAVIOR_HANDLER~IS_SUPPORTED.
  RV_SUPPORTED = abap_true.
endmethod.
* <SIGNATURE>---------------------------------------------------------------------------------------+
* | Instance Public Method ZCL_AXT_CUSTOM_BEHAVIOR->IF_AXT_DATATYPE_HANDLER~ADJUST_GET_P
* +-------------------------------------------------------------------------------------------------+
* | [--->] IS_FIELD                       TYPE        AXTS_RUNTIME_EXT_FIELD
* | [--->] IV_COMPONENT                   TYPE        STRING
* | [--->] IO_CURRENT                     TYPE REF TO IF_BOL_BO_PROPERTY_ACCESS(optional)
* | [--->] IV_PROPERTY                    TYPE        STRING
* | [--->] IV_DISPLAY_MODE                TYPE        ABAP_BOOL
* | [--->] IV_ORIGINAL_VALUE              TYPE        STRING
* | [--->] IV_IS_TABLE                    TYPE        ABAP_BOOL (default =ABAP_FALSE)
* | [--->] IV_IS_SEARCH                   TYPE        ABAP_BOOL (default =ABAP_FALSE)
* | [<-()] RV_VALUE                       TYPE        STRING
* +--------------------------------------------------------------------------------------</SIGNATURE>
  METHOD IF_AXT_DATATYPE_HANDLER~ADJUST_GET_P.
    CASE iv_property.
      WHEN if_bsp_wd_model_setter_getter=>fp_fieldtype.
        IF iv_is_table = abap_true OR iv_is_search = abap_true.
          rv_value = cl_bsp_dlc_view_descriptor=>field_type_input.
        ELSE.
          rv_value = cl_bsp_dlc_view_descriptor=>field_type_textarea.
        ENDIF.
      WHEN if_bsp_wd_model_setter_getter=>fp_textarea_rows.
        rv_value = 10.
      WHEN OTHERS.
        rv_value = super->if_axt_datatype_handler~adjust_get_p(
           is_field          = is_field
           iv_component      = iv_component
           io_current        = io_current
           iv_property       = iv_property
           iv_display_mode   = iv_display_mode
           iv_original_value = iv_original_value ).
    ENDCASE.
  ENDMETHOD.                    "IF_AXT_DATATYPE_HANDLER~ADJUST_GET_P
* <SIGNATURE>---------------------------------------------------------------------------------------+
* | Instance Public Method ZCL_AXT_CUSTOM_BEHAVIOR->IF_AXT_DATATYPE_HANDLER~ADJUST_SET
* +-------------------------------------------------------------------------------------------------+
* | [--->] IS_FIELD                       TYPE        AXTS_RUNTIME_EXT_FIELD
* | [--->] IV_ATTRIBUTE_PATH              TYPE        STRING
* | [--->] IV_COMPONENT                   TYPE        STRING
* | [--->] IO_CURRENT                     TYPE REF TO IF_BOL_BO_PROPERTY_ACCESS
* | [--->] IV_UI_VALUE                    TYPE        STRING
* | [--->] IT_FORM_FIELDS                 TYPE        TIHTTPNVP(optional)
* | [<-->] CV_VALUE                       TYPE        ANY
* +--------------------------------------------------------------------------------------</SIGNATURE>
method IF_AXT_DATATYPE_HANDLER~ADJUST_SET.
DATA: tsl TYPE timestampl,
      lv_zone type TZONREF-TZONE value 'UTC',
      lv_time TYPE string.
GET TIME STAMP FIELD tsl.
lv_time = | Edited by: { tsl TIMESTAMP = ISO
                   TIMEZONE = lv_zone }|.
 CONCATENATE cv_value lv_time INTO cv_value SEPARATED BY cl_abap_char_utilities=>cr_lf.
endmethod.
ENDCLASS.

When you create extension field, choose "Not defined" as Field type, and choose the entry maintained in step1 as "Render/Validate As":

Click Enable Expert Mode and assign one data element to this extension field:

Generate the extension field and make it visible in WebUI. After I maintain some value for this field and click save:

the ADJUST_SET method of handler class is called and the timestamp is appended:

SAP AET fields的自定義行為

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