You could try SXML as the source of the transformation (why do you use FIEB_... function module?), especially CL_SXML_DATASET_READER for getting data "directly" from the input file.
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You could try SXML as the source of the transformation (why do you use FIEB_... function module?), especially CL_SXML_DATASET_READER for getting data "directly" from the input file.