Does anyone know the issue on this formula expression ?
You seem to be mixing fields [Since Last Sale] and [Stock last sale]. Either way, both should be numerical field types.
@Buddhi_DB have you set both the data types to doubleif yes try running this this will work else add some sample data will help with flowmark done if solved.
Yes, I changed it to double thanks to you all and now It's working @Raj @PhilipMannering