M9-SO-1099 'On Demand' Sales Order Fill Report

Greetings,

We are running an older release of Sage 100 (4.50.40) and we have a third party extended solution called M9-SO-1099 'On Demand' Sales Order Fill Report which was provided by Blytheco.

The manual for the add-on is here.
https://wiki.blythecodev.com/index.php/M9-SO-1099_%27On_Demand%27_Sales_Order_Fill_Report

I cannot find any information on the exact logic of this add-on. You can select the fillable amount prior to running the report, however if one sets the value to 0 shouldn't it show all open sales orders?

When we do this, however it does not operate this way. Can someone who is more knowledgeable about this explain how the orders are selected?

Regards,
MOB