Custom field doesn't fill when converting sales order to invoice

Custom field doesn't fill when converting sales order to invoice

Hi, 

When I convert a Sales Order to an Invoice one of the custom fields on a product line names "Subsidie" does not seem to fill in automatically. I manually have to select the product again by clicking on the product name in the order line en re-select the product. Then the field does fill. 

I've added some screens to hopefully help make it more clear. 

Hope you can assist.

Thanks!

Coen