How to add a third field to a join table?

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I successfully implemented the seven step instruction piece that Todd
O'Bryan detailed in the post 'Many to Many Relation'. That would be a great
addition to the Cayenne docs!

Now, I need to add a new field to the link table 'UserToRole'. This new
field, 'YYZ', will represent the importance of a specific Role for a User as
an integer. YYZ clearly cannot be in the Role table since Roles are reused
and each may have a different importance. Based on Todd's instructions, I
don't have an objEntity called UserToRole, and now I suspect I will need one
due to this new field. Currently, I can retrieve a List of Role objects from
within User, but how would I get to this new field YYZ?

Please advise.

Thanks,
Joseph

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