2 way match - partial invoice

Hi,

We are looking to start using the 2 way match process. Many of our non-stock orders for services are entered with a quantity of 1 for the total amount of the service. If I try to do a 2 way match and enter an amount less than what's on the PO the line is getting closed. I'd like for it to remain open with the remainder.

Is this possible? Do we need to maybe change the way we are entering the original non-stock PO and enter X quantity at $1.00 so that we can do partials if needed?