Word documents using the Office Open XML format (docx) can be filled without AddIn (since ProOffice version 4.0).
In general it is recommend to install the AddIn by a software distribution.
If any Word application is used, when ProObjectLib is installing ProNovia SAPtoWord AddIn it may lead to an error.
The AddIn will only be installed once (or after an up-date). If this error occurres, all Word applications must be closed and the automatic filling (or Installation) must be repeated.