When would one enable bidirectional relationship on both sides of bridge table?

Question

I'm trying to learn about bidirectional relationships involving bridge table.

I have BridgeOrders having 1:M relation with FactSales.

And 1:M relation with FactCharges.

Product Dimensions filters the FactSales.

So that the filter flows from FactSales to the BridgeOrders to FactCharges, I have enabled the bidirectional relationship between BridgeOrders and FactSales.

Now selecting a Product shows me corresponding sales and their charges.

In the same table visual or a slicer if I add ChargeName, then it seems to filter the table visual for that respective ChargeName.

So, I'm trying to understand under what situation will I need to enable the bidirectional relationship between BridgeOrders and FactCharges? What will that achieve?

Answer 1

Based on my experience so far, there has never been any "absolute necessity" to implement bidirectional relationship.

No doubt bidirectional relationship brings convenience in certain scenarios; it might also produce side effect without be noticed. Here's a good reference to delve into details of bidiretional relationship,

Bidiretional relationship and ambiguity in DAX