When using HandiSoft Document Manager with MS Word for merging documents you may encounter the following message:
' An error occurred while opening the document. The message returned was: The openDataSource method or property is not available because this command is not available for reading'
Microsoft Word OpenDataSource method is called as part of a Mail Merge operation.
The error may occur when attempting to edit or create a Mail Merge document.
This message may occur if a document is saved in Microsoft Word in reading mode. When in reading mode, the software is not allowed to call a method (perform a task) on the document which results in the error message.
Open any Microsoft Office Word file on your computer (ideally one of your mail merge templates)
Click File
Click Options or Word Options
Click General
Untick the box for "Open e-mail attachments and other uneditable files in reading view"
Click Ok
Close the document
Open the template that was giving the error message and perform the merge.