I started working wih Memento a few days ago and I am impressed what it appears to be possible to do with this system.
I am an experienced computer user, but not an IT engineer or a programmer.
My objective is to setup a system of Libraries to manage data in a small shop (customers, product and service catalogs and sales invoices) and I feel I already made significant progress since I started a few days ago, but I already spent many hours, making testes and searching the forum and I still cannot resolve a problem I have.
I have this Sales library (lines of an Invoice) :-

/ Field INV # Is extracted correctly from an Invoices Library.
/ Field Description extracts Correctly from the field Descrption in the Product Library.
/ Field Price extracts again Description from the Product Library and I have not been able to figure out how to extract the field Price from Product. As we can expect the calculation in Total (Price X Quantity) has an error message.
The result is:-

The Product Library Looks like this:-

Please help me learn how to extract the two separate fields from Products (Description and Price) into Sales.
Thanks in advance. IV