Hello, It appears that the relationship between the tables 'donor' and 'library' is not good, in the sense that making 'library' a sub-class of 'donor' breaks the mart. In MartBuilder, a red-line is drawn between 'donor' and its sub-class 'library', but I could not find out what that concretely means.
A workaround I found involves merging 'library' and 'donor', which then directly exposes tables linked to 'library' as dimension tables of 'donor'. Whilst that the workaround provides a functioning mart, I am wondering whether there is a better solution to the problem. Any suggestions? Thanks, Joachim
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