anyone know why when using some location on IF it not showing GL impact

What are you fulfilling? A Sales Order or a Transfer Order?

i<m trying to fulfill the SO

That screenshot is from a Fulfillment?

Yes

What's your costing method? Average? If so, does the item in the IF have a location-specific cost in that fulfillment location?

@Luis Yes the item costing method is avg, how to check location specific cost