Hi there,
I stopped using Inventoria last June and am just using Express Invoice now. I track my inventory using another method now. But here's what I remember from it. I'm using 3.99 on a Mac 10.9.5.
In your Express Invoice preferences, I assume you've gone into the OTHER section, then INVENTORIA SYNCHRONIZATION SETTINGS, and allowed Express Invoice to sync with Inventoria? As a side note, when I would add a new item in Inventoria, before using Express Invoice I would tell it to UPDATE NOW in this particular dialogue box, especially if I had just created it.
Then in the Express Invoice preferences, OTHER section, ADVANCED SETTINGS, have you told it to allow Express Invoice to update stock levels in Inventoria when invoices are generated?
Go to the menu bar of Express Invoice and select the INVOICES drop down. Then open your ITEMS LIST. (This can be done with command + T on a Mac. I assume there's a shortcut for Windows also.) Open up item 123 and select the INVENTORY tab. You don't want Express Invoice to manage your stock levels if Inventoria is doing it also.
In Inventoria, go to your preferences. Select OTHER, then ADVANCED SETTINGS. Have you checked the box to allow Express Invoice to sync with Inventoria?
Did you migrate your items from Inventoria to Express Invoice? This is found on the menu bar of Express Invoice under INVOICES. Select MIGRATE INVENTORIA ITEMS TO EXPRESS INVOICE.
Is it possible that it's a problem with locations in Inventoria? You have to select a location to which Express Invoice can sync. While viewing item 123 in Inventoria, is one location saying 12 and another -6? This may make it appear as if you have 2 item number 123's, when in reality you don't, you have 2 locations for this item. For example, we have several different places from where we might sell our stock. Because Express Invoice couldn't sync with all the locations, I created a location called "Sales" for synchronization purposes. When we had a sale we would have to go into Inventoria and do a transfer from the actual location to the Sales location to make it balance properly.
Hope this helps!
Teri