QuickView to show accounts with specific Flow Constraint

XFMemberProperty is just a lookup: it will return the value of a property for a specific member (in your case, the currently expanded Account).

What you're after is an expansion filter, a .Where; e.g. A#BS.Base.Where(FlowConstraint DoesNotContain 'MVT_GEN')

Unfortunately, I don't think .Where supports filtering on FlowConstraint - but I might be wrong, try it yourself.

Workarounds:

• duplicate the FlowConstraint on a Text property, for example Text8, so you can use A#BS.Base.Where(Text8 DoesNotContain 'MVT_GEN')
• Generate the list of accounts, turn it into excel formulas, and add a column that reports the FlowConstraint for each of them, using XFMemberProperty, then add Excel filtering.
• Write a custom Member List in a Finance Business Rule. Then you can use it anywhere like this:
  A#Root.[MyBRRuleName,MyListName]