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LEISTUNG_BY_REFERENCE - Copy service master with reference
LEISTUNG_CHECK - Service master: check whether master record exists
LEISTUNG_HIERARCHY_READ - Service master: read hierarchy service and wage type
LEISTUNG_READ - Read service master and short text
LEISTUNG_READ_0 - Read service master
LEISTUNG_READ_TEXT - Service master: read short text in specified language
LEISTUNG_STLV_READ - NOTRANSL: Leistung ermitteln durch STLV-Nummer
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