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EPLAN reads article reference properties from function or if corresponding propoerty does not exists on function or is empty, then it is taken directly from the article. User needs to remember that setting values which removes property value for article reference property causes that they are read from article. Here is list of such values for each type: LONG - 0, STRING - empty string, BOOL - false, DOUBLE - 0.0 and for MULTILANGSTRING - empty multi lang string.

Reference

MergedArticleReferencePropertyList Class
MergedArticleReferencePropertyList Members