How to loop over Excel files in a folder and append them to one Example Set containing all files

Hi,

I was trying to loop over 3 Excel files in a folder and append them to one Example Set containing all 3 Example Sets.
Plotting over a continuously id shows that unfortunately my final Example Set contains 3 times the first Example Set.

I was looping over the parameter index of the select operator which selects a file of the loop files subprocess which contains the read Excel operator.

Can someone please help me to solve the problem?

Best

Ella

Attached Process:

<?xml version="1.0" encoding="UTF-8"?><process version="9.5.001">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="9.5.001" expanded="true" name="Process">
    <parameter key="logverbosity" value="init"/>
    <parameter key="random_seed" value="2001"/>
    <parameter key="send_mail" value="never"/>
    <parameter key="notification_email" value=""/>
    <parameter key="process_duration_for_mail" value="30"/>
    <parameter key="encoding" value="SYSTEM"/>
    <process expanded="true">
      <operator activated="true" class="concurrency:loop_parameters" compatibility="9.5.001" expanded="true" height="82" name="Loop Parameters" width="90" x="45" y="85">
        <list key="parameters">
          <parameter key="Select.index" value="[1.0;3;2;linear]"/>
        </list>
        <parameter key="error_handling" value="fail on error"/>
        <parameter key="log_performance" value="true"/>
        <parameter key="log_all_criteria" value="false"/>
        <parameter key="synchronize" value="false"/>
        <parameter key="enable_parallel_execution" value="true"/>
        <process expanded="true">
          <operator activated="true" class="concurrency:loop_files" compatibility="9.5.001" expanded="true" height="82" name="Loop Files" width="90" x="45" y="85">
            <parameter key="filter_type" value="glob"/>
            <parameter key="recursive" value="false"/>
            <parameter key="enable_macros" value="false"/>
            <parameter key="macro_for_file_name" value="file_name"/>
            <parameter key="macro_for_file_type" value="file_type"/>
            <parameter key="macro_for_folder_name" value="folder_name"/>
            <parameter key="reuse_results" value="false"/>
            <parameter key="enable_parallel_execution" value="true"/>
            <process expanded="true">
              <operator activated="true" class="read_excel" compatibility="9.5.001" expanded="true" height="68" name="Read Excel" width="90" x="45" y="85">
                <parameter key="sheet_selection" value="sheet number"/>
                <parameter key="sheet_number" value="1"/>
                <parameter key="imported_cell_range" value="A1"/>
                <parameter key="encoding" value="SYSTEM"/>
                <parameter key="first_row_as_names" value="true"/>
                <list key="annotations"/>
                <parameter key="date_format" value=""/>
                <parameter key="time_zone" value="SYSTEM"/>
                <parameter key="locale" value="English (United States)"/>
                <parameter key="read_all_values_as_polynominal" value="false"/>
                <list key="data_set_meta_data_information"/>
                <parameter key="read_not_matching_values_as_missings" value="true"/>
                <parameter key="datamanagement" value="double_array"/>
                <parameter key="data_management" value="auto"/>
              </operator>
              <connect from_op="Read Excel" from_port="output" to_port="output 1"/>
              <portSpacing port="source_file object" spacing="0"/>
              <portSpacing port="source_input 1" spacing="0"/>
              <portSpacing port="sink_output 1" spacing="0"/>
              <portSpacing port="sink_output 2" spacing="0"/>
            </process>
          </operator>
          <operator activated="true" class="select" compatibility="9.5.001" expanded="true" height="68" name="Select" width="90" x="246" y="85">
            <parameter key="index" value="1"/>
            <parameter key="unfold" value="false"/>
          </operator>
          <connect from_op="Loop Files" from_port="output 1" to_op="Select" to_port="collection"/>
          <connect from_op="Select" from_port="selected" to_port="output 1"/>
          <portSpacing port="source_input 1" spacing="0"/>
          <portSpacing port="sink_performance" spacing="0"/>
          <portSpacing port="sink_output 1" spacing="0"/>
          <portSpacing port="sink_output 2" spacing="0"/>
        </process>
      </operator>
      <operator activated="true" class="append" compatibility="9.5.001" expanded="true" height="82" name="Append" width="90" x="179" y="85">
        <parameter key="datamanagement" value="double_array"/>
        <parameter key="data_management" value="auto"/>
        <parameter key="merge_type" value="all"/>
      </operator>
      <operator activated="true" class="generate_id" compatibility="9.5.001" expanded="true" height="82" name="Generate ID" width="90" x="313" y="85">
        <parameter key="create_nominal_ids" value="false"/>
        <parameter key="offset" value="0"/>
      </operator>
      <connect from_op="Loop Parameters" from_port="output 1" to_op="Append" to_port="example set 1"/>
      <connect from_op="Append" from_port="merged set" to_op="Generate ID" to_port="example set input"/>
      <connect from_op="Generate ID" from_port="example set output" to_port="result 1"/>
      <portSpacing port="source_input 1" spacing="0"/>
      <portSpacing port="sink_result 1" spacing="0"/>
      <portSpacing port="sink_result 2" spacing="0"/>
    </process>
  </operator>
</process>