run entity\sumRelated from an other entity

[zerosix]

in the formula we can launch entity\sumRelated for the current entity A (the link is opportunities) is like
entity\sumRelated('opportunities', 'amountConverted', 'won') but how can we do this from an other entity to run this

[yuri]

There's no such function. Options:

* Implement a custom function.
* Run another workflow rule switching the target entity.
* Utilize BPM sub-processes, switch the target entity.