"Doug Robbins - Word MVP" wrote:

It sounds like you do not have any merge fields in the mailmerge main
document. Is there something between the and does it match the
names of the fields in the data source.

Somewhat belated, I would like to thank Doug Robins for his answer.
I solved the problem and executed the job - so the problem ceased to be one.
I don't know what has been the reason that it didn't and then did work.
Kind regards
flowe