question about relation

Discussion created by aliabbassipro on Jun 6, 2017
Latest reply on Jun 6, 2017 by philmodjunk


previously I ask a question about this relation and I can't find my correct answer.

what is (X) mark? this project is available on FileMaker Advanced 15 and now I working on it.

I want to know about this relation type because I don't know anything about this type.

please explain to me what is (X) and why here we use this not (=)