Can you activate a free text code from Navision in the header in W

[Rasmus]

(Word 2003)

In my work I have programmed a lot of documents. In this connection I have
programmed my documents to retrieve data from Navision in certain situations.
(eg, date, customer number, etc.). My problem is that these data codes are
located in the header and will not be activated. How do I activate them?

 

[Rasmus]

btw, It works fine in normal text. The problem occurs when I type in the header