Solution : https://service.sap.com/sap/support/notes/202078 (SAP Service marketplace login required)
Key words :
system generates error message fs216 ', vendor invoice/credit memo, open item account item, vendor line item, entered line items, invalid tax code, output tax code, fs216 reason, tax category, customer account
Related Notes :
| 318782 | Gap in document number assignment for FS215/FS216 |