Error using document templates in CRM module

Hello, NAV Attain 3.10A/MS Word 2000 Sometimes I get the following message when using the wizard to create an interaction: “Doc32 is a mail merge main document. Word cannot find its datasource, Samenvoegbron33.” This is a message from Microsoft Word 2000. When closing Navision and reopen it again will sometimes solve the problem. Does anyone has an idea what can cause the problem?? Thanks in advance for any help. Jeroen Schuyt