Found the issue - **bug in Sage 2016**
AP_InvoiceHistoryDetail record has a null value in ExtendedDescriptionKey$ field
Use Excel/Access or method of your choice to list all records with null in AP_InvoiceHistoryDetail ExtendedDescriptionKey$. Create an import to update null field with 10 zeros and import back into system.
Hope that Sage fixes it soon, else I imagine running this export/import routine for awhile.