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SDU_RELATION_ADD - UDM Create relationship

SDU_RELATION_EDIT - UDM Edit relationship

SDU_RELATION_ENVIRONMENT - EDM Relationship Environment for a Set of Entity types

SDU_RELATION_FETCH - UDM get several relationships

SDU_RELATION_SELECT - EDM Relationship Closure for a Set of Entity Types

SDU_RELATION_START - EDM relationships initial module

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