Update document action

Hi,

From an item in the list A, I want to create a word document in the library B and update this document with values from the item.

So I did a workflow in the list A with the following steps:

1. create a word doc in library B based on a specific content type

2. update the document with item's values

The creation of the document is working fine but not the update. I recevied the error message saying that the document cannot be opened.

Any idea what could block this? 

I've tried to update the document directly in the library and it's working fine. 

Thanks for your help

Regards,

Géraldine