retrieve a list with empty association

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I want to retrieve a list of Objects (A) that have empty association of Object (B). I am using the following x-path in retrieve action: [module.A_B/module.B/id=empty] but return empty list although there are some Objects of (A) which have no relation with (B ).
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1 answers
11

Empty associations should be retrieved using not: [not(Modul.eA_B/module.B)]

For further info see here: https://forum.mendix.com/questions/1550/Constrain-on-empty-variable-in-microflow-retrieve

and here: https://world.mendix.com/display/NRG/XPath+not

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