What does Function Module 'LE_EAN128_LABEL_READ' do?

Hi, experts! I have no idea about this FM and cannot find the helpful documentation. Could you tell me what can we get after calling this FM?
Here is the code snippet about calling this FM:
* get data
CALL FUNCTION 'LE_EAN128_LABEL_READ'
    EXPORTING
      is_output_record       = nast
    IMPORTING
      es_label_data          = label_data
      es_ean128_data         = ean128
    EXCEPTIONS
      object_does_not_exist = 01
      conversion_has_failed = 02
      internal_error_occured = 03
      OTHERS                 = 99.
Appreciate for your help!

ean128 barcode can have multiple information embedded in it using separators known as Application identifier (AI). These AIs are defined by GS1.
When SAP wants to print an ean128 barcode it first need to retrieve values to be embedded in the barcode. This is where LE_EAN128_LABEL_READ comes in picture. FM put data in structure EAN128 which is later passed to FM LE_EAN128_ENCODE to create ean128 barcode string using AIs.
These AIs are configured in SAP system in view V_T313D. Can also be reached using menu path SPRO->Logistics Execution->Mobile Data Entry->Bar Code->Maintain Bar Code Specification.
Regards,
Pawan.
PS: There is a FM called LE_EAN128_DECODE which decode ean128 barcode and put values back in sap EAN128 structure based on config in V_T313D.

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