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SPML trick to remove last value of a multi value attribute?

We're Able to delete a single value from a multivalue VA Now in SPML, but unable to remove  the last value standing in that multivalue  VA.  Is there some trick in SPML to accomplish this task?

  • Approached this task from a different angle ... I targeted my SPML request to a native AD multi-value attribute and it works as expected.

    I can "replace" any value from the collection, including the last value by specifying an empty string ('') which appears to remove all values.

    However, any attempt to remove a value from a created virtual attribute results in the message 'Cannot remove the specified  item because it was not found the specified collection"

    I can query the values - and see them, but using a value returned from the lookup, I still see 'not found in the specified collection' when I attempt to remove one.