Hi, My simplified situation: Three entities A (1-n) B (n-n) C (where C refers to B) So multiple C records can be assigned to a B record. Assume I have multiple A records with each several B and each several C records. All records have unique names. I have a grid for records of B and an MF button to assign C records. The MF opens a selection screen with XPath and should show all records that are already used in other B records but not in the selected B record. Excluding the already assigned to B record is no problem with [not(MyModule.C_B='[%CurrentObject%]')] But then I get also all C records that are part of other A records. So I should make this something like [MyModule.C_B/MyModule.B/MyModule.B_A='A' and not(MyModule.C_B='[%CurrentObject%]')] But 'A' is not available in the XPath. Any idea how I can get only the C records which are part of the "A-tree" without creating an extra association between A and C (1-n)? The issue is a bit similar to "Using associations in XPath Constraint" https://forum.mendixcloud.com/link/questions/8811 but is not really answered yet (to my opinion). Thanks in advance.
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