I have an app which I built that allows a user to update a record in our Dynamics CRM application (On Premsis).
However when the user 'saves' on the app I need it to update a lookup field in the same record.
The lookup field is to another entity in Dynamics, however I don't know how to retrieve the GUID for the other entity.
There is a "link" between the two entities in the form of a text field in the main entity which is also unqiue and is in the entity I wish to link to.
However I am not sure how within the app I can retrieve the ID of the other entity based on this relationship and then set that in the new field.