Difference in pass-by value vs pass-by reference in AL language

Important detail that caused me a bug recently and I want to share with others who are writing AL Code for Business Central. When you pass a record to a procedure then you can do that either by pass-by value or pass-by reference. When you have code like this: CurrPage.SetSelectionFilter(ApprovalEntriesSelected); ApproveEntry(ApprovalEntriesSelected); and you pass-by value: procedure ApproveEntry(Entry: Record "Approval Workflow Entry") then all filters are cleared on the record and you get a empty record on your procedure.