Hi Heather,
What are the exact ranges for customer(s), item(s) and dates you have selected on the Items tab of the History lookup, that is causing items to not be selected unless the Order checkbox is selected?
To start with, ensure that you can select items off of invoices by choosing to lookup ALL customers and items - have the customer/item range be from blank to zzzzzzzzzzzzzz - for the date range YTD (year to date) or even for the last 3 years . If this selection provides no data for the item lookup, do a data integrity check and include checking history (an option in the company profile). The history orders / invoices / credit notes screens show the document 'headers', and the history item lookup lists the document 'details'. You may have a corrupted history detail file and the details are gone. View one of your more recent historical invoices and see if the Details tab shows anything.
If you do get items to appear, then start narrowing your search by selecting a particular customer or item as the range, perhaps based on the data that is selected on the screen.
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Regards,
Softrak Tech Support