Recently in my project I had the requirement to show up a multiselect lookup for selecting records across multiple custom entities. The customer have created a PCF control where they have designed to show the selected records spanning entities. But the issue was to show a lookup control to allow the user to select multiple records spanning entities.
Thankfully there is a method now to do exactly the same using Client API.
The below code shows how to show up a multiselect lookup control from account and contact entity. However you can do the same for all custom entities.
Below is how it looks.
Hope this helps!
Debajit Dutta
(Dynamics MVP)
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