Restrict node drop action in some groups

@kishangajjar wrote:

In my application, I have let’s say 100 nodes. Out of those 100, I have requirement that 50 nodes can be dropped in Group A ONLY, and the remaining 50 nodes can be dropped in Group B ONLY.

So I want to restrict the dropping of nodes in wrong groups. How can I achieve this?

I have implemented memberValidation function but it’s not helping me. Even though I return false from memberValidation function it still adds node to the group.

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