ODATAv4 IN Clause NOT WORKING

I am trying to filter the data coming in from acumatica using an IN CLAUSE on the PMTask object.

My URL Looks like this

{{acumaticaurl}}/odatav4/PX_Objects_PM_PMTask?$format=json&filter=ProjectID in (683,684,687,686,685)&$select=ProjectID, TaskCD, TaskID,NoteID, ExtRefNbr,Description

No matter, what changes I do to the filter, it is fetching all the tasks from the database. How do I get the IN filter to work?

Edit:
The same syntax is working on the PMCostBudget object. The operation filters the records being fetched.

{{acumaticaurl}}/odatav4/PX_Objects_PM_PMCostBudget?$format=json&$filter=ProjectID in (683, 684, 687, 686, 685)&$select=ProjectID, Type, Qty, UOM, CuryUnitRate, Rate, CuryAmount

Thanks in advance!