Form grid need filter in DataSource Table InventTableModule for desire output

Does anyone help me as given attached. I am trying to Selling Price of item.

First i created a Form and Datasource table is InventTableModule.

when i drag & drop ItemId & Price field from from datasource table InventTableModule to form Grid. I am getting 3 prices. I opened table InventTableModule then i found this is because of field ModuleType.

Each item price have 3 ModuleType (Inventory,Purshase,Sales order).

But i need only ModuleTpye(Sales order) price.

Please tell me how to write method to get what is want

Thanks